20 files changed, 2061 insertions, 972 deletions

diff --git a/dub.sdl b/dub.sdl
index 04bb8d0..6feb4ce 100644
--- a/dub.sdl
+++ b/dub.sdl
@@ -137,7 +137,8 @@ configuration "sdp-debug-unittest-ldc" {
   platforms            "posix"
   compiler             "ldc2"
   targetName           "sdp-debug-ldc"
-  dflags               "-J=views" "-I=src/sdp" "-Dddocs"
+  dflags               "-J=views" "-I=src/sdp"
+  #dflags               "-J=views" "-I=src/sdp" "-Dddocs"
   buildRequirements    "allowWarnings"
   buildOptions         "verbose" "debugMode" "debugInfo" "unittests" "optimize"
   debugVersions        "checkdoc" "summary"
diff --git a/makefile b/makefile
index 821edda..2f63b04 100644
--- a/makefile
+++ b/makefile
@@ -41,7 +41,7 @@ PRG_BIN=$(PRG_NAME)
 PRG_BINDIR=./bin
 PRG_DOCDIR=./docs
 # ORG
-ORG_VERSION=20160725
+ORG_VERSION=20161214
 EMACSLISP=/usr/share/emacs/site-lisp
 EMACSLISP_ORG=~/.emacs.d/elpa/org-$($(shell echo $(ORG_VERSION)))
 EMACSLISP_ORG_CONTRIB=~/.emacs.d/elpa/org-plus-contrib-$($(shell echo $(ORG_VERSION)))
diff --git a/maker.org b/maker.org
index c3d44e5..5e6a3c7 100644
--- a/maker.org
+++ b/maker.org
@@ -15,13 +15,13 @@
 [[./org/sdp.org][sdp.org]]  [[./org/][org/]]
 
 * sdp makefile                                                     :makefile:
-** TODO settings [+2]                                              :settings:
-*** alternative D compilers (dmd/ldc2/gdc) [+1]                    :compiler:
+** TODO settings [+2]                                             :settings:
+*** alternative D compilers (dmd/ldc2/gdc) [+1]                  :compiler:
 
 http://dlang.org/download.html
 https://wiki.dlang.org/Compilers
 
-**** dmd [#A]                                                           :dmd:
+**** dmd [#A]                                                        :dmd:
 
 http://dlang.org/
 
@@ -32,7 +32,7 @@ DMD_FLAGS_RELEASE=-O -inline -release
 DMD_FLAG_BINOF=-of
 #+END_SRC
 
-**** ldc2 [#A]                                                          :ldc:
+**** ldc2 [#A]                                                       :ldc:
 
 https://github.com/ldc-developers/ldc
 
@@ -43,7 +43,7 @@ LDC_FLAGS_RELEASE=-O4 -inline -release
 LDC_FLAG_BINOF=-of=
 #+END_SRC
 
-**** TODO gdc                                                           :gdc:
+**** TODO gdc                                                        :gdc:
 
 #+BEGIN_SRC makefile :tangle makefile
 GDC=gdc
@@ -52,26 +52,26 @@ GDC_FLAGS_RELEASE=-march=native -O3 -pipe -frelease
 GDC_FLAG_BINOF=-o
 #+END_SRC
 
-*** build tools (dub/rdmd) [+1]                                  :build:tool:
-**** rdmd                                                              :rdmd:
+*** build tools (dub/rdmd) [+1]                                :build:tool:
+**** rdmd                                                           :rdmd:
 
 #+BEGIN_SRC makefile :tangle makefile
 RDMD=rdmd
 RDMD_FLAGS=--build-only --compiler=
 #+END_SRC
 
-**** dub [#A]                                                           :dub:
+**** dub [#A]                                                        :dub:
 
 #+BEGIN_SRC makefile :tangle makefile
 DUB=dub
 DUB_FLAGS=-v --force --compiler=
 #+END_SRC
 
-*** TODO [#A] set/select: ~D compiler~ & ~debug flags~ [+1] [2/2]        :select:
+*** TODO [#A] set/select: ~D compiler~ & ~debug flags~ [+1] [2/2]      :select:
 - [X] Set D_COMPILER (one of DMD LDC or GDC)
 - [X] Set debug flags (using DMD standard flag -debug=)
 
-**** TODO SET compiler: "SET_D_COMPILER=":                  :compiler:select:
+**** TODO SET compiler: "SET_D_COMPILER=":               :compiler:select:
 [[http://wiki.dlang.org/Compilers][D Compilers wiki]]
 [[http://dlang.org/download.html][D Compilers download]]
 Set D_COMPILER one of DMD, LDC or GDC e.g.: SET_D_COMPILER=DMD
@@ -147,8 +147,9 @@ Set debug flags using DMD standard flag -debug= e.g.:
   structattrib
   summary
   table
+  toc
 
-*** D compiler settings [+1]                              :settings:compiler:
+*** D compiler settings [+1]                            :settings:compiler:
 **** compiler settings
 
 #+BEGIN_SRC makefile :tangle makefile
@@ -176,7 +177,7 @@ endif
 DUB_FLAGS_DEBUG :=$(shell echo $(DC_FLAGS_DEBUG_SET)| sed -e "s/-debug/--debug/g"| sed -e "s/-unittest//g")
 #+END_SRC
 
-*** Project Details                                             :project:sdp:
+*** Project Details                                           :project:sdp:
 
 #+BEGIN_SRC makefile :tangle makefile
 PRG_NAME=sdp
@@ -187,11 +188,11 @@ PRG_BINDIR=./bin
 PRG_DOCDIR=./docs
 #+END_SRC
 
-*** Emacs Org settings                            :settings:emacs:org:tangle:
+*** Emacs Org settings                          :settings:emacs:org:tangle:
 
 #+BEGIN_SRC makefile :tangle makefile
 # ORG
-ORG_VERSION=20160725
+ORG_VERSION=20161214
 EMACSLISP=/usr/share/emacs/site-lisp
 EMACSLISP_ORG=~/.emacs.d/elpa/org-$($(shell echo $(ORG_VERSION)))
 EMACSLISP_ORG_CONTRIB=~/.emacs.d/elpa/org-plus-contrib-$($(shell echo $(ORG_VERSION)))
@@ -200,7 +201,7 @@ ORGFILES=""
 ORGDIR=$(shell echo `pwd`)
 #+END_SRC
 
-** "make" commands [+2]                                       :make:commands:
+** "make" commands [+2]                                      :make:commands:
 - build commands
   - build
   - debug
@@ -216,8 +217,8 @@ ORGDIR=$(shell echo `pwd`)
 - git snapshot
   - gitsnapshot
 
-*** build commands [+1]                                       :build:compile:
-**** build rebuild                                            :build:rebuild:
+*** build commands [+1]                                     :build:compile:
+**** build rebuild                                         :build:rebuild:
 
 ***** compilers
 #+BEGIN_SRC makefile :tangle makefile
@@ -234,7 +235,7 @@ makefile_new:
 	make -k tangle_maker
 #+END_SRC
 
-***** TODO _dub_ build rebuild [#A]                                       :dub:
+***** TODO _dub_ build rebuild [#A]                                   :dub:
 
 ****** generic
 #+BEGIN_SRC makefile :tangle makefile
@@ -296,7 +297,7 @@ dub_release_test_dmd: tangle dub_dmd_release_test
 dub_release_test_ldc: tangle dub_ldc_release_test
 #+END_SRC
 
-***** rdmd build rebuild                                               :rdmd:
+***** rdmd build rebuild                                           :rdmd:
 
 #+BEGIN_SRC makefile :tangle makefile
 rdmd: $(PRG_SRCDIR)/$(PRG_SRC)
@@ -305,7 +306,7 @@ rdmd: $(PRG_SRCDIR)/$(PRG_SRC)
 	$(PRG_SRCDIR)/$(PRG_NAME)/$(PRG_SRC)
 #+END_SRC
 
-**** debug                                                            :debug:
+**** debug                                                         :debug:
 ***** debug
 
 #+BEGIN_SRC makefile :tangle makefile
@@ -354,7 +355,7 @@ debug_rdmd_gdc: $(PRG_SRCDIR)/$(PRG_SRC)
 	$(PRG_SRCDIR)/$(PRG_NAME)/$(PRG_SRC)
 #+END_SRC
 
-**** release                                                        :release:
+**** release                                                     :release:
 
 ***** release
 
@@ -374,7 +375,7 @@ release_rdmd: distclean tangle $(PRG_SRCDIR)/$(PRG_SRC)
 	$(PRG_SRCDIR)/$(PRG_SRC)
 #+END_SRC
 
-*** init clean distclean etc.                                         :clean:
+*** init clean distclean etc.                                       :clean:
 
 #+BEGIN_SRC makefile :tangle makefile
 skel:
@@ -409,7 +410,7 @@ distclean_and_init: expunge
 	mkdir -p $(PRG_BINDIR);
 #+END_SRC
 
-*** Org Babel Tangle batch process command                           :tangle:
+*** Org Babel Tangle batch process command                         :tangle:
 **** tangle: org babel tangle *.org
 #+BEGIN_SRC makefile :tangle makefile
 tangle: skel
@@ -470,10 +471,10 @@ gitsnapshot: distclean tangle
 #+END_SRC
 
 * TODO configuration misc                                     :configuration:
-** dub                                                                  :dub:
+** dub                                                                 :dub:
 Every DUB package should contain a [[http://code.dlang.org/package-format?lang=json][dub.json]] (or [[http://code.dlang.org/package-format?lang=sdl][dub.sdl]])
 
-*** TODO dub.sdl [#A]                                                   :sdl:
+*** TODO dub.sdl [#A]                                                 :sdl:
 
 **** header                                                       :header:
 #+BEGIN_SRC sh  :tangle dub.sdl
@@ -650,7 +651,8 @@ configuration "sdp-debug-unittest-ldc" {
   platforms            "posix"
   compiler             "ldc2"
   targetName           "sdp-debug-ldc"
-  dflags               "-J=views" "-I=src/sdp" "-Dddocs"
+  dflags               "-J=views" "-I=src/sdp"
+  #dflags               "-J=views" "-I=src/sdp" "-Dddocs"
   buildRequirements    "allowWarnings"
   buildOptions         "verbose" "debugMode" "debugInfo" "unittests" "optimize"
   debugVersions        "checkdoc" "summary"
@@ -740,7 +742,7 @@ configuration "sdp-debug-docs-gdc" {
 }
 #+END_SRC
 
-*** +dub.json+                                                           :json:
+*** +dub.json+                                                         :json:
 
 **** +sdp+
 #+BEGIN_SRC json  :tangle no
@@ -760,7 +762,7 @@ configuration "sdp-debug-docs-gdc" {
 }
 #+END_SRC
 
-** .gitignore                                                     :gitignore:
+** .gitignore                                                    :gitignore:
 
 #+BEGIN_SRC sh :tangle .gitignore
 # git ls-files --others --exclude-from=.git/info/exclude
@@ -793,7 +795,7 @@ configuration "sdp-debug-docs-gdc" {
 #*.\#*
 #+END_SRC
 
-** sh script to batch process emacs org babel tangle    :shell_script:tangle:
+** sh script to batch process emacs org babel tangle   :shell_script:tangle:
   [[http://orgmode.org/manual/Batch-execution.html]]
 creates a shell batch script called "tangle", that will tangle (emacs org
 babel tangle) org files in ./org/ to create .d source files in ./src/sdp/
@@ -827,18 +829,18 @@ emacs --batch -Q -q \
 #+END_SRC
 
 * dub zfunc                                                           :zfunc:
-** ,dubdmd                                                              :dmd:
+** ,dubdmd                                                             :dmd:
 #+BEGIN_SRC sh  :tangle no
 time dub --compiler=dmd -v --force
 #+END_SRC
 
-** ,dubldc                                                              :ldc:
+** ,dubldc                                                             :ldc:
 #+BEGIN_SRC sh  :tangle no
 time dub --compiler=ldc2 -v --force
 #+END_SRC
 * D build notes                                                       :notes:
-** compilers                                                       :compiler:
-*** dmd [#A]                                                            :dmd:
+** compilers                                                      :compiler:
+*** dmd [#A]                                                          :dmd:
 
 #+BEGIN_SRC sh
 dmd -de -w -J./views -I./src/sdp -unittest -debug=checkdoc -debug=summary -debug=dumpdoc -of./bin/sdp ./src/sdp.d
@@ -846,7 +848,7 @@ dmd -de -w -J./views -I./src/sdp -of./bin/sdp ./src/sdp.d
 dmd -de -w -J./views -I./src/sdp -O -release -of./bin/sdp ./src/sdp.d
 #+END_SRC
 
-*** ldc2 [#A]                                                          :ldc2:
+*** ldc2 [#A]                                                        :ldc2:
 
 #+BEGIN_SRC sh
 ldc2 -de -w -J./views -I./src/sdp -unittest -d-debug=checkdoc -d-debug=summary -d-debug=dumpdoc -of=./bin/sdp ./src/sdp.d
@@ -854,7 +856,7 @@ ldc2 -de -w -J./views -I./src/sdp -of=./bin/sdp ./src/sdp.d
 ldc2 -de -w -J./views -I./src/sdp -O4 -release -of=./bin/sdp ./src/sdp.d
 #+END_SRC
 
-*** gdc (not done) [#F]                                                 :gdc:
+*** gdc (not done) [#F]                                               :gdc:
 
 not done
 
@@ -867,8 +869,8 @@ not done
 "gdc might be worth a shot if your code is compatible", profan
 re: dmd "one can easily get 2x (and even more) speedup by simply switching to gdc -O2", ketmar
 
-** build tools                                                   :build:tool:
-*** rdmd [#C]                                                          :rdmd:
+** build tools                                                  :build:tool:
+*** rdmd [#C]                                                        :rdmd:
 
 flags similar to dmd
 
@@ -884,7 +886,7 @@ rdmd -de -w -J./views -I./src/sdp -unittest -debug=checkdoc -debug=summary -debu
 rdmd -de -w -J./views -I./src/sdp -unittest -d-debug=checkdoc -d-debug=summary -d-debug=dumpdoc --compiler=ldc2 -of./bin/sdp ./src/sdp.d
 #+END_SRC
 
-*** dub [#A]                                                            :dub:
+*** dub [#A]                                                          :dub:
 https://github.com/dlang/dub/
 http://code.dlang.org/getting_started
 http://code.dlang.org/docs/commandline
@@ -955,9 +957,10 @@ dub --compiler=ldc2 -v --force --config=sdp-debug-clean  # sdp-debug-clean
 # time ~sdp3/bin/sdp-debug-clean -v --html --no-assert en/autonomy_markup0.sst
 #+END_SRC
 
-** TODO debug options list [#A]                                       :debug:
+** TODO debug options list [#A]                                      :debug:
 
 #+BEGIN_SRC sh  :tangle no
+debugVersions "asserts"
 debugVersions "biblio"
 debugVersions "biblio0"
 debugVersions "bibliobuild"
@@ -977,6 +980,9 @@ debugVersions "configfile"
 debugVersions "dumpdoc"
 debugVersions "endnotes"
 debugVersions "endnotes_build"
+debugVersions "epubmanifest"
+debugVersions "epub_archive"
+debugVersions "epub_output"
 debugVersions "footnotes"
 debugVersions "footnotesdone"
 debugVersions "glossary"
@@ -1004,6 +1010,7 @@ debugVersions "parabulletindent"
 debugVersions "paraindent"
 debugVersions "paraindenthang"
 debugVersions "parent"
+debugVersions "paths"
 debugVersions "poem"
 debugVersions "quote"
 debugVersions "raw"
@@ -1022,12 +1029,16 @@ debugVersions "section_bookindex"
 debugVersions "section_bookindex_seg"
 debugVersions "section_bookindex_scroll"
 debugVersions "section_blurb"
+debugVersions "segnames"
+debugVersions "sisupod"
+debugVersions "sisupod_zip"
 debugVersions "source"
 debugVersions "srclines"
 debugVersions "structattrib"
 debugVersions "summary"
 debugVersions "table"
 debugVersions "toc"
+debugVersions "toc_nav_dom"
 #+END_SRC
 
 ** make (emacs)
diff --git a/org/ao_debugs.org b/org/ao_debugs.org
index c35ff2e..39fdbac 100644
--- a/org/ao_debugs.org
+++ b/org/ao_debugs.org
@@ -301,7 +301,7 @@ debug(section_body) {
 
 #+name: ao_output_debugs
 #+BEGIN_SRC d
-debug(dom) {
+debug(toc_nav_dom) {
   enum DomTags { none, open, close, close_and_open, open_still, }
   foreach (sect; doc_matters.keys_seq_seg) {
     foreach (obj; contents[sect]) {
@@ -313,10 +313,10 @@ debug(dom) {
             break;
           case DomTags.close_and_open :
             writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
-            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
             break;
           case DomTags.open :
-            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
             break;
           default :
             break;
@@ -336,10 +336,10 @@ debug(dom) {
             break;
           case DomTags.close_and_open :
             writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
-            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
             break;
           case DomTags.open :
-            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+            writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
             break;
           default :
             break;
diff --git a/org/ao_doc_abstraction.org b/org/ao_doc_abstraction.org
index 355c126..240b8df 100644
--- a/org/ao_doc_abstraction.org
+++ b/org/ao_doc_abstraction.org
@@ -14,6 +14,22 @@
 
 [[./sdp.org][sdp]]  [[./][org/]]
 * 0. the document notes
+** abstraction
+- abstract for downstream processing
+  - identify document structure and objects
+    - identify document structure (headings/levels/sections)
+    - identify objects
+  - set document, generate common abstraction for downstream parsing
+    - set different document sections, toc, body, endnotes, book index, etc.
+    - object numbers, heading/ chapter numbering etc, endnote numbers
+  - unify object representations
+    - multiple markups for same object type given single representation
+  - extract object attributes
+  - unify inline markup on objects
+    - inline markup made easier to identify
+
+- simplify downstream parsing
+
 ** document sections
 
 |--------------+--------------+---+---+--------------------------------------------------+---+---+---|
@@ -1784,6 +1800,12 @@ this can be extracted earlier)
 Build here:
 - DOM structure
 - ancestors and decendants
+  - ancestors could be determined earlier, but convenient to have here
+  - descendants could be in the form of: headings contained under current
+    heading, and/or; the range of objects under the current heading
+- you could decide on a sequential object list, containing all objects (both
+  substantive and non-substantive objects), in addition to ocn, which are for
+  substantive/ citable objects within the document
 
 (as needed) up to document heading 1~, lev4 html:
 
@@ -3126,6 +3148,22 @@ void _poem_block_(L,O,T,C,N,Ma)(
 
 ***** table block                                                 :table:
 
+there are 3 types of table markup that need to be nomalized (given a single representation) here
+
+- curly brace block
+- tic block
+- special notation block
+
+you need:
+- identify the type for the munging to create uniform presentation
+  - curly, tick, special
+  - table heading row, bool
+- present table header info in uniform way
+  - table_number_of_columns, int (count)
+  - table_column_widths, int[] column widths (as given or calculate average)
+  - show table walls, bool
+- table content marked up in uniform way
+
 #+name: abs_functions_block_table
 #+BEGIN_SRC d
 void _table_block_(L,O,T,Ma)(
diff --git a/org/defaults.org b/org/defaults.org
index cb4ee80..b83308d 100644
--- a/org/defaults.org
+++ b/org/defaults.org
@@ -911,103 +911,226 @@ private import
 #+name: defaults_template_paths
 #+BEGIN_SRC d
 template SiSUpaths() {
-  string _base_filename(string fn_src) {
-    string _fn_base = "";
-    if (extension(fn_src) == ".sst") {
-      _fn_base = baseName(fn_src, ".sst");
-    } else if (extension(fn_src) == ".ssm") {
-      _fn_base = baseName(fn_src, ".ssm");
-    }
-    return _fn_base;
-  }
+#+END_SRC
+
+**** base
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
   struct DirPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
   }
+#+END_SRC
+
+**** sisupod
+
+***** pod
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
   struct SiSUpodPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
+    }
+    string sisupod_filename(string fn_src) {
+      return "sisupod".chainPath(base_filename(fn_src) ~ ".zip").array;
+    }
+    string base(string fn_src) {
+      return "sisupod".chainPath(base_filename(fn_src)).array;
+    }
+  }
+#+END_SRC
+
+***** pod zipped
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
+  struct SiSUpodPathsZipped {
+    auto spod_pths = SiSUpodPaths();
+    string base_filename(string fn_src) {
+      return spod_pths.base_filename(fn_src);
+    }
+    string sisupod_filename(string fn_src) {
+      return spod_pths.sisupod_filename(fn_src);
     }
     string base(string fn_src) {
-      return chainPath("sisupod", _base_filename(fn_src)).array;
+      return spod_pths.base(fn_src);
     }
-    string doc(string fn_src) {
-      return chainPath(base(fn_src), "doc").array;
-      // return chainPath(base(fn_src), "text").array;
+    auto doc_root(string fn_src) {
+      return "doc";
     }
-    string doc_lng(string fn_src, string lng) {
-      return chainPath(doc(fn_src), lng).array;
+    auto doc(string fn_src) {
+      return doc_root(fn_src);
     }
-    string conf(string fn_src) {
-      return chainPath(doc(fn_src), "_sisu").array;
+    auto doc_lng(string fn_src, string lng) {
+      return doc_root(fn_src).chainPath(lng).array;
     }
-    string image(string fn_src) {
-      return chainPath(conf(fn_src), "image").array;
+    auto conf(string fn_src) {
+      return doc_root(fn_src).chainPath("_sisu").array;
     }
-    string css(string fn_src) {
-      return chainPath(conf(fn_src), "css").array;
+    auto image(string fn_src) {
+      return conf(fn_src).chainPath("image").array;
     }
-    string fn_doc(string fn_src, string lng) {
-      return chainPath((doc_lng(fn_src, lng)), baseName(fn_src)).array;
+    auto css(string fn_src) {
+      return conf(fn_src).chainPath("css").array;
     }
-    string fn_doc_insert(string fn_src, string fn_insert, string lng) {
-      return chainPath((doc_lng(fn_src, lng)), baseName(fn_insert)).array;
+    auto fn_doc(string fn_src, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_src)).array;
+    }
+    auto fn_doc_insert(string fn_src, string fn_insert, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_insert)).array;
     }
   }
+#+END_SRC
+
+***** pod unzipped archive
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
+  struct SiSUpodPathsFilesystemArchive {
+    auto spod_pths = SiSUpodPaths();
+    string base_filename(string fn_src) {
+      return spod_pths.base_filename(fn_src);
+    }
+    string sisupod_filename(string fn_src) {
+      return spod_pths.sisupod_filename(fn_src);
+    }
+    string base(string fn_src) {
+      return spod_pths.base(fn_src);
+    }
+    auto doc_root(string fn_src) {
+      return base(fn_src).chainPath("doc").array;
+    }
+    auto doc(string fn_src) {
+      return doc_root(fn_src);
+    }
+    auto doc_lng(string fn_src, string lng) {
+      return doc_root(fn_src).chainPath(lng).array;
+    }
+    auto conf(string fn_src) {
+      return doc_root(fn_src).chainPath("_sisu").array;
+    }
+    auto image(string fn_src) {
+      return conf(fn_src).chainPath("image").array;
+    }
+    auto css(string fn_src) {
+      return conf(fn_src).chainPath("css").array;
+    }
+    auto fn_doc(string fn_src, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_src)).array;
+    }
+    auto fn_doc_insert(string fn_src, string fn_insert, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_insert)).array;
+    }
+  }
+#+END_SRC
+
+**** html5
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
   struct HtmlPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
     string base() {
-      return chainPath("en", "html").array;
+      return "en".chainPath("html").array;
     }
     string seg(string fn_src) {
-      return chainPath(base, _base_filename(fn_src)).array;
+      return base.chainPath(base_filename(fn_src)).array;
     }
     string fn_scroll(string fn_src) {
-      return chainPath(base, _base_filename(fn_src) ~ ".html").array;
+      return base.chainPath(base_filename(fn_src) ~ ".html").array;
     }
     string fn_seg(string fn_src, string seg_filename) {
-      return chainPath(seg(fn_src), seg_filename ~ ".html").array;
+      return seg(fn_src).chainPath(seg_filename ~ ".html").array;
     }
   }
-  struct EpubPaths {
+#+END_SRC
+
+**** epub3
+
+#+name: defaults_template_paths
+#+BEGIN_SRC d
+  struct Epub3paths {
+    string dirtop() {
+      return "".chainPath("").array;
+    }
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
     string base() {
-      return chainPath("en", "epub").array;
+      return "en".chainPath("epub3").array;
     }
-    string doc(string fn_src) {
-      return chainPath(base, _base_filename(fn_src)).array;
+    string epub_file(string fn_src) {
+      return base.chainPath(base_filename(fn_src) ~ ".epub").array;
+    }
+    string docdir(string fn_src) {
+      return base.chainPath(base_filename(fn_src)).array;
     }
     string doc_meta_inf(string fn_src) {
-      return chainPath(doc(fn_src), "META-INF").array;
+      return dirtop.chainPath("META-INF").array;
     }
     string doc_oebps(string fn_src) {
-      return chainPath(doc(fn_src), "OEBPS").array;
+      return dirtop.chainPath("OEBPS").array;
     }
     string doc_oebps_css(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "css").array;
+      return doc_oebps(fn_src).chainPath("css").array;
     }
     string doc_oebps_image(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "image").array;
+      return doc_oebps(fn_src).chainPath("image").array;
     }
     string fn_mimetypes(string fn_src) {
-      return chainPath(doc(fn_src), "mimetypes").array;
+      return dirtop.chainPath("mimetypes").array;
     }
     string fn_dmi_container_xml(string fn_src) {
-      return chainPath(doc_meta_inf(fn_src), "container.xml").array;
+      return doc_meta_inf(fn_src).chainPath("container.xml").array;
+    }
+    string fn_oebps_toc_nav_xhtml(string fn_src) {
+      return doc_oebps(fn_src).chainPath("toc_nav.xhtml").array;
     }
     string fn_oebps_toc_ncx(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "toc.ncx").array;
+      return doc_oebps(fn_src).chainPath("toc.ncx").array;
     }
     string fn_oebps_content_opf(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "content.opf").array;
+      return doc_oebps(fn_src).chainPath("content.opf").array;
     }
     string fn_oebps_content_xhtml(string fn_src, string seg_filename) {
-      return chainPath(doc_oebps(fn_src), seg_filename ~ ".xhtml").array;
+      return doc_oebps(fn_src).chainPath(seg_filename ~ ".xhtml").array;
+    }
+    debug(epub_output) {
+      string dbg_doc_meta_inf(string fn_src) {
+        return docdir(fn_src).chainPath("META-INF").array;
+      }
+      string dbg_doc_oebps(string fn_src) {
+        return docdir(fn_src).chainPath("OEBPS").array;
+      }
+      string dbg_doc_oebps_css(string fn_src) {
+        return doc_oebps(fn_src).chainPath("css").array;
+      }
+      string dbg_doc_oebps_image(string fn_src) {
+        return doc_oebps(fn_src).chainPath("image").array;
+      }
+      string dbg_fn_mimetypes(string fn_src) {
+        return docdir(fn_src).chainPath("mimetypes").array;
+      }
+      string dbg_fn_dmi_container_xml(string fn_src) {
+        return doc_meta_inf(fn_src).chainPath("container.xml").array;
+      }
+      string dbg_fn_oebps_toc_nav_xhtml(string fn_src) {
+        return doc_oebps(fn_src).chainPath("toc_nav.xhtml").array;
+      }
+      string dbg_fn_oebps_toc_ncx(string fn_src) {
+        return doc_oebps(fn_src).chainPath("toc.ncx").array;
+      }
+      string dbg_fn_oebps_content_opf(string fn_src) {
+        return doc_oebps(fn_src).chainPath("content.opf").array;
+      }
+      string dbg_fn_oebps_content_xhtml(string fn_src, string seg_filename) {
+        return doc_oebps(fn_src).chainPath(seg_filename ~ ".xhtml").array;
+      }
     }
   }
 }
@@ -1072,8 +1195,7 @@ template InternalMarkup() {
     auto tc_o = "┏"; //"『"; // "┏" ┓
     auto tc_c = "┚"; // "』"; // "┚"  table row mark #Mx[:tc_c]="』\n"
     auto tc_p = "┆";   // table col/misc mark
-    string indent_by_spaces_provided(int indent) {
-      auto _indent_spaces ="░░";   // auto nbsp = "░";
+    string indent_by_spaces_provided(int indent, string _indent_spaces ="░░") {
       _indent_spaces = replicate(_indent_spaces, indent);
       return _indent_spaces;
     }
diff --git a/org/output.org b/org/output.org
index e84796d..a9fdc74 100644
--- a/org/output.org
+++ b/org/output.org
@@ -17,7 +17,7 @@
 
 #+BEGIN_SRC d :tangle ../src/sdp/output_hub.d
 /++
-  output hub<BR>
+  output hub<br>
   check & generate output types requested
 +/
 template outputHub() {
@@ -38,13 +38,14 @@ template outputHub() {
     std.traits,
     std.typecons,
     std.uni,
-    std.utf,
+    std.utf;
+  import
     defaults,
-    output_epub,
+    output_epub3,
     output_html,
     output_xhtmls,
-    source_sisupod;
-  import
+    source_sisupod,
+    create_zip_file,
     output_rgx,
     output_xhtmls;
   void outputHub(D,I)(D doc_abstraction, I doc_matters) {
@@ -83,10 +84,10 @@ template outputHub() {
       if ((doc_matters.opt_action_bool["verbose"])) {writeln("html scroll done");}
     }
     if (doc_matters.opt_action_bool["epub"]) {
-      if ((doc_matters.opt_action_bool["verbose"])) {write("epub processing... ");}
-      outputEPub!()(doc_abstraction, doc_matters);
+      if ((doc_matters.opt_action_bool["verbose"])) {write("epub3 processing... ");}
+      outputEPub3!()(doc_abstraction, doc_matters);
       // epub.css_write;
-      if ((doc_matters.opt_action_bool["verbose"])) {writeln("epub done");}
+      if ((doc_matters.opt_action_bool["verbose"])) {writeln("epub3 done");}
     }
     if (doc_matters.opt_action_bool["pdf"]) {
       /+ mixin outputPDF; +/
@@ -117,27 +118,53 @@ private import
   std.algorithm,
   std.array,
   std.container,
+  std.digest.sha,
   std.exception,
   std.file,
   std.getopt,
   std.json,
-  std.process,
-  std.stdio,
+  std.outbuffer,
   std.path,
+  std.process,
   std.range,
   std.regex,
+  std.stdio,
   std.string,
   std.traits,
   std.typecons,
   std.uni,
   std.utf,
+  std.zip,
   std.conv : to;
 import
+  create_zip_file,
   defaults,
   output_rgx,
   output_xhtmls;
 #+END_SRC
 
+** _zip_
+*** template                                                     :template:
+
+#+BEGIN_SRC d :tangle ../src/sdp/create_zip_file.d
+template createZipFile() {
+  import std.file;
+  import std.outbuffer;
+  import std.string;
+  import std.zip;
+  void createZipFile(
+    string zip_file_name,
+    void[] compressed_zip_data,
+  ) {
+    try {
+      write(zip_file_name, compressed_zip_data);
+    } catch (ZipException ex) {
+      // Handle Errors
+    }
+  }
+}
+#+END_SRC
+
 ** _sisupod_                                                         :sisupod:
 *** template                                                     :template:
 
@@ -162,12 +189,13 @@ template SiSUpod() {
 
 #+name: source_sisupod_init
 #+BEGIN_SRC d
-debug(asserts){
+debug(asserts) {
   // static assert(is(typeof(doc_matters) == tuple));
 }
 mixin SiSUoutputRgxInit;
 mixin SiSUpaths;
-auto pth_sisupod = SiSUpodPaths();
+auto pth_sisupod = SiSUpodPathsZipped();
+auto pth_sisupod_filesystem = SiSUpodPathsFilesystemArchive();
 mixin SiSUlanguageCodes;
 auto lang = Lang();
 auto rgx = Rgx();
@@ -177,20 +205,20 @@ assert (doc_matters.source_filename.match(rgx.src_fn));
 #+name: source_sisupod_mkdirs
 #+BEGIN_SRC d
 /+ create directory structure +/
-if (!exists(pth_sisupod.doc(doc_matters.source_filename))) {
-  pth_sisupod.doc(doc_matters.source_filename).mkdirRecurse;
+if (!exists(pth_sisupod_filesystem.doc(doc_matters.source_filename))) {
+  pth_sisupod_filesystem.doc(doc_matters.source_filename).mkdirRecurse;
 }
-if (!exists(pth_sisupod.conf(doc_matters.source_filename))) {
-  pth_sisupod.conf(doc_matters.source_filename).mkdirRecurse;
+if (!exists(pth_sisupod_filesystem.conf(doc_matters.source_filename))) {
+  pth_sisupod_filesystem.conf(doc_matters.source_filename).mkdirRecurse;
 }
-if (!exists(pth_sisupod.css(doc_matters.source_filename))) {
-  pth_sisupod.css(doc_matters.source_filename).mkdirRecurse;
+if (!exists(pth_sisupod_filesystem.css(doc_matters.source_filename))) {
+  pth_sisupod_filesystem.css(doc_matters.source_filename).mkdirRecurse;
 }
-if (!exists(pth_sisupod.image(doc_matters.source_filename))) {
-  pth_sisupod.image(doc_matters.source_filename).mkdirRecurse;
+if (!exists(pth_sisupod_filesystem.image(doc_matters.source_filename))) {
+  pth_sisupod_filesystem.image(doc_matters.source_filename).mkdirRecurse;
 }
-if (!exists(pth_sisupod.doc_lng(doc_matters.source_filename, doc_matters.language))) {
-  pth_sisupod.doc_lng(doc_matters.source_filename, doc_matters.language).mkdirRecurse;
+if (!exists(pth_sisupod_filesystem.doc_lng(doc_matters.source_filename, doc_matters.language))) {
+  pth_sisupod_filesystem.doc_lng(doc_matters.source_filename, doc_matters.language).mkdirRecurse;
 }
 #+END_SRC
 
@@ -200,54 +228,158 @@ if (!exists(pth_sisupod.doc_lng(doc_matters.source_filename, doc_matters.languag
 #+BEGIN_SRC d
 debug(sisupod) {
   writeln(__LINE__, ": ",
-    // doc_matters.environment["pwd"], "/",
-      doc_matters.source_filename, " -> ",
-    // doc_matters.environment["pwd"], "/",
-      pth_sisupod.fn_doc(
-        doc_matters.source_filename,
-        doc_matters.language
-  ));
-}
-if (exists(doc_matters.source_filename)) {
-  copy(
+    doc_matters.source_filename, " -> ",
+    pth_sisupod_filesystem.fn_doc(
     doc_matters.source_filename,
-    pth_sisupod.fn_doc(
-      doc_matters.source_filename,
-      doc_matters.language
+    doc_matters.language
   ));
 }
-if (doc_matters.file_insert_list.length > 0) {
-  foreach (insert_file; doc_matters.file_insert_list) {
-    debug(sisupod) {
+auto zip = new ZipArchive();
+auto fn_sisupod = pth_sisupod.sisupod_filename(doc_matters.source_filename);
+{ /+ bundle images +/
+  foreach (image; doc_matters.image_list) {
+    debug(sisupodimages) {
       writeln(
+        "_sisu/image/", image, " -> ",
+        pth_sisupod.image(doc_matters.source_filename), "/", image
+      );
+    }
+    auto fn_src = "_sisu/image/"~ image;
+    auto fn_out =  pth_sisupod.image(doc_matters.source_filename).to!string ~ "/" ~ image;
+    auto fn_out_filesystem =  pth_sisupod_filesystem.image(doc_matters.source_filename).to!string ~ "/" ~ image;
+    if (exists(fn_src)) {
+      fn_src.copy(fn_out_filesystem);
+      {
+        auto zip_arc_member_file = new ArchiveMember();
+        zip_arc_member_file.name = fn_out;
+        auto zip_data = new OutBuffer();
+        zip_data.write(cast(char[]) ((fn_src).read));
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+      }
+    }
+  }
+}
+{ /+ bundle sisu_document_make +/
+  auto fn_src = "_sisu/sisu_document_make"; // check (_sisu/sisu_document_make)
+  auto fn_out = pth_sisupod.conf(doc_matters.source_filename).to!string ~ "/" ~ "sisu_document_make";
+  auto fn_out_filesystem = pth_sisupod_filesystem.conf(doc_matters.source_filename).to!string ~ "/" ~ "sisu_document_make";
+  if (exists(fn_src)) {
+    fn_src.copy(fn_out_filesystem);
+    {
+      auto zip_arc_member_file = new ArchiveMember();
+      zip_arc_member_file.name = fn_out;
+      auto zip_data = new OutBuffer();
+      zip_data.write((fn_src).readText);
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+    }
+  }
+}
+{ /+ bundle primary file +/
+  auto fn_src = doc_matters.source_filename;
+  auto fn_out = pth_sisupod.fn_doc(doc_matters.source_filename, doc_matters.language).to!string;
+  auto fn_out_filesystem = pth_sisupod_filesystem.fn_doc(doc_matters.source_filename, doc_matters.language).to!string;
+  if (exists(fn_src)) {
+    fn_src.copy(fn_out_filesystem);
+    {
+      auto zip_arc_member_file = new ArchiveMember();
+      zip_arc_member_file.name = fn_out;
+      auto zip_data = new OutBuffer();
+      zip_data.write((fn_src).readText);
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+    }
+  }
+}
+{ /+ bundle insert files +/
+  if (doc_matters.file_insert_list.length > 0) {
+    foreach (insert_file; doc_matters.file_insert_list) {
+      debug(sisupod) {
+        writeln(
           insert_file, " -> ",
           pth_sisupod.fn_doc_insert(
             doc_matters.source_filename,
             insert_file,
             doc_matters.language
-      ));
-    }
-    if (exists(insert_file)) {
-      insert_file.copy(
-        pth_sisupod.fn_doc_insert(
-          doc_matters.source_filename,
-          insert_file,
-          doc_matters.language
-      ));
+        ));
+      }
+      auto fn_src = insert_file;
+      auto fn_out = pth_sisupod.fn_doc_insert(
+        doc_matters.source_filename,
+        insert_file,
+        doc_matters.language
+      ).to!string;
+      auto fn_out_filesystem = pth_sisupod_filesystem.fn_doc_insert(
+        doc_matters.source_filename,
+        insert_file,
+        doc_matters.language
+      ).to!string;
+      if (exists(fn_src)) {
+        fn_src.copy(fn_out_filesystem);
+        {
+          auto zip_arc_member_file = new ArchiveMember();
+          zip_arc_member_file.name = insert_file;
+          auto zip_data = new OutBuffer();
+          zip_data.write((fn_src).readText);
+          zip_arc_member_file.expandedData = zip_data.toBytes();
+          zip.addMember(zip_arc_member_file);
+          createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+        }
+      }
     }
   }
 }
-foreach (image; doc_matters.image_list) {
-  debug(sisupod) {
-    writeln(
-        "_sisu/image/", image, " -> ",
-        pth_sisupod.image(doc_matters.source_filename), "/", image
-    );
+#+END_SRC
+
+*** sha256 of sisupod.zip, zip debug, read zip archive
+
+#+name: source_sisupod_copy
+#+BEGIN_SRC d
+if (exists(fn_sisupod)) {
+  try {
+    auto data = (cast(byte[]) (fn_sisupod).read);
+    writefln("%-(%02x%) %s", data.sha256Of, fn_sisupod);
+    debug(sisupod) {
+      try {
+        auto zipped = new ZipArchive((fn_sisupod).read);
+        foreach (filename, member; zipped.directory) {
+          auto data = zipped.expand(member);
+          writeln("> ", filename, " length ", data.length); // filename == member.name
+          // Use data
+        }
+      }
+      catch (ZipException ex) {
+        // Handle errors
+      }
+      if (doc_matters.source_filename == "en/the_wealth_of_networks.yochai_benkler.sst") {
+        assert(
+          ((data).sha256Of).toHexString
+          == "DDE0013C13C6A4F06D4BE72087E2CDEF47697CA38A6A2D65BA7207DB6B144271",
+          "\nsisupod: sha256 value for "
+          ~ doc_matters.source_filename
+          ~ " has changed, is now: "
+          ~ ((data).sha256Of).toHexString
+        );
+      }
+      if (doc_matters.source_filename == "en/sisu_markup_stress_test.sst") {
+        assert(
+          ((data).sha256Of).toHexString
+          == "112C0AEDD2518A1803D91A7CF5785274A3116C0779A631782D0C0813B212C68A",
+          "\nsisupod: sha256 value for "
+          ~ doc_matters.source_filename
+          ~ " has changed, is now: "
+          ~ ((data).sha256Of).toHexString
+        );
+      }
+    }
   }
-  if (exists("_sisu/image/"~ image)) {
-    ("_sisu/image/"~ image).copy(
-      (pth_sisupod.image(doc_matters.source_filename) ~ "/" ~ image)
-    );
+    catch (ErrnoException ex)
+  {
+    // Handle errors
   }
 }
 #+END_SRC
@@ -279,7 +411,7 @@ string special_characters(string _txt){
     .replaceAll(rgx.xhtml_ampersand,    "&amp;")
     .replaceAll(rgx.xhtml_less_than,    "&lt;")
     .replaceAll(rgx.xhtml_greater_than, "&gt;")
-    .replaceAll(rgx.xhtml_line_break,   "<br>");
+    .replaceAll(rgx.xhtml_line_break,   "<br />");
   return _txt;
 }
 #+END_SRC
@@ -329,7 +461,7 @@ string _xhtml_anchor_tags(const(string[]) anchor_tags) {
 auto scroll_head(Me)(
   Me dochead_meta,
 ) {
-  debug(asserts){
+  debug(asserts) {
     static assert(is(typeof(dochead_meta) == string[string][string]));
   }
   string o;
@@ -337,26 +469,27 @@ auto scroll_head(Me)(
 <html>
 <head>
   <meta charset="utf-8">
-  <title>
-    %s%s
-  </title>
-<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
-  <meta name="dc.title" content="Title" />
-  <meta name="dc.author" content="Author" />
-  <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
-  <meta name="dc.date" content="year" />
-  <meta name="dc.date.created" content="year" />
-  <meta name="dc.date.issued" content="year" />
-  <meta name="dc.date.available" content="year" />
-  <meta name="dc.date.valid" content="year" />
-  <meta name="dc.date.modified" content="year" />
-  <meta name="dc.language" content="US" />
-  <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
-  <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
-    <link rel="generator" href="http://www.sisudoc.org/" />
+    <title>
+      %s%s
+    </title>
+    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+    <meta name="dc.title" content="Title" />
+    <meta name="dc.author" content="Author" />
+    <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
+    <meta name="dc.date" content="year" />
+    <meta name="dc.date.created" content="year" />
+    <meta name="dc.date.issued" content="year" />
+    <meta name="dc.date.available" content="year" />
+    <meta name="dc.date.valid" content="year" />
+    <meta name="dc.date.modified" content="year" />
+    <meta name="dc.language" content="US" />
+    <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
+    <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
+  </meta>
+  <link rel="generator" href="http://www.sisudoc.org/" />
   <link rel="shortcut icon" href="../_sisu/image/rb7.ico" />
-  <link href="../../_sisu/css/html.css" rel="stylesheet">
-  <link href="../../../_sisu/css/html.css" rel="stylesheet">
+  <link href="../../_sisu/css/html.css" rel="stylesheet" />
+  <link href="../../../_sisu/css/html.css" rel="stylesheet" />
 </head>
 <body lang="en">
 <a name="top" id="top"></a>¶",
@@ -374,7 +507,7 @@ dochead_meta["title"]["full"],
 auto seg_head(Me)(
   Me dochead_meta,
 ) {
-  debug(asserts){
+  debug(asserts) {
     static assert(is(typeof(dochead_meta) == string[string][string]));
   }
   string o;
@@ -382,26 +515,27 @@ auto seg_head(Me)(
 <html>
 <head>
   <meta charset="utf-8">
-  <title>
-    %s%s
-  </title>
-<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
-  <meta name="dc.title" content="Title" />
-  <meta name="dc.author" content="Author" />
-  <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
-  <meta name="dc.date" content="year" />
-  <meta name="dc.date.created" content="year" />
-  <meta name="dc.date.issued" content="year" />
-  <meta name="dc.date.available" content="year" />
-  <meta name="dc.date.valid" content="year" />
-  <meta name="dc.date.modified" content="year" />
-  <meta name="dc.language" content="US" />
-  <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
-  <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
-    <link rel="generator" href="http://www.sisudoc.org/" />
+    <title>
+      %s%s
+    </title>
+    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+    <meta name="dc.title" content="Title" />
+    <meta name="dc.author" content="Author" />
+    <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
+    <meta name="dc.date" content="year" />
+    <meta name="dc.date.created" content="year" />
+    <meta name="dc.date.issued" content="year" />
+    <meta name="dc.date.available" content="year" />
+    <meta name="dc.date.valid" content="year" />
+    <meta name="dc.date.modified" content="year" />
+    <meta name="dc.language" content="US" />
+    <meta name="dc.rights" content="Copyright: Copyright (C) year holder" />
+    <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
+  </meta>
+  <link rel="generator" href="http://www.sisudoc.org/" />
   <link rel="shortcut icon" href="../_sisu/image/rb7.ico" />
-  <link href="../../_sisu/css/html.css" rel="stylesheet">
-  <link href="../../../_sisu/css/html.css" rel="stylesheet">
+  <link href="../../_sisu/css/html.css" rel="stylesheet" />
+  <link href="../../../_sisu/css/html.css" rel="stylesheet" />
 </head>
 <body lang="en">
 <a name="top" id="top"></a>¶",
@@ -485,13 +619,13 @@ auto inline_links(O)(
 #+name: xhtml_format_objects
 #+BEGIN_SRC d
 auto inline_notes_scroll(O)(
-  auto return ref const O         obj,
-  string                  _txt,
+  auto return ref const O   obj,
+  string                    _txt,
 ) {
   if (obj.inline_notes_reg) {
     _txt = (_txt).replaceAll(
       rgx.inline_notes_delimiter_al_regular_number_note,
-      ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&nbsp;<sup>$1</sup>&nbsp;</note></a>")
+      ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&#160;<sup>$1</sup>&#160;</note></a>")
     );
   }
   debug(markup_endnotes) {
@@ -535,7 +669,7 @@ auto inline_notes_seg(O)(
         "\">",
         "<note id=\"note_",
         m.captures[1],
-        "\">&nbsp;<sup>",
+        "\">&#160;<sup>",
         m.captures[1],
         ".</sup></note></a>",
         m.captures[2],
@@ -544,7 +678,7 @@ auto inline_notes_seg(O)(
     }
     _txt = (_txt).replaceAll(
       rgx.inline_notes_delimiter_al_regular_number_note,
-      ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&nbsp;<sup>$1</sup>&nbsp;</note></a>")
+      ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&#160;<sup>$1</sup>&#160;</note></a>")
     );
   } else if (_txt.match(rgx.inline_notes_delimiter_al_regular_number_note)) {
     debug(markup) {
@@ -625,7 +759,7 @@ auto heading(O)(
   auto tags = _xhtml_anchor_tags(obj.anchor_tags);
   string o;
   if (obj.obj_cite_number.empty) {
-    o = format(q"¶<br><hr /><br>
+    o = format(q"¶<br /><hr /><br />
   <div class="substance">
     <h%s class="%s">%s
       %s
@@ -638,7 +772,7 @@ auto heading(O)(
       obj.heading_lev_markup,
     );
   } else {
-    o = format(q"¶<br><hr /><br>
+    o = format(q"¶<br /><hr /><br />
   <div class="substance">
     <label class="ocn"><a href="#%s" class="lnkocn">%s</a></label>
     <h%s class="%s" id="%s"><a name="%s"></a>%s
@@ -707,7 +841,7 @@ auto para(O)(
   auto tags = _xhtml_anchor_tags(obj.anchor_tags);
   _txt = font_face(_txt);
   string o;
-  _txt = (obj.bullet) ? ("●&nbsp;&nbsp" ~ _txt) : _txt;
+  _txt = (obj.bullet) ? ("●&#160;&#160;" ~ _txt) : _txt;
   if (obj.obj_cite_number.empty) {
     o = format(q"¶  <div class="substance">
   <p class="%s" indent="h%si%s">%s
@@ -942,7 +1076,6 @@ auto block(O)(
 </div>¶",
       obj.is_a,
       _txt
-      // obj.text
     );
   } else {
     o = format(q"¶  <div class="substance">
@@ -956,7 +1089,6 @@ auto block(O)(
       obj.is_a,
       obj.obj_cite_number,
       _txt
-      // obj.text
     );
   }
   return o;
@@ -1008,9 +1140,9 @@ auto verse(O)(                           // using code from code block, review
 ) {
   _txt = font_face(_txt);
   _txt = (_txt)
-    .replaceAll(rgx.newline, "<br>\n")
-    .replaceAll(rgx.two_spaces, "&nbsp;" ~ "&nbsp;" ~ "&nbsp;" ~ "&nbsp;")
-    .replaceAll(rgx.nbsp_and_space, "&nbsp;" ~ "&nbsp;")
+    .replaceAll(rgx.newline, "<br />\n")
+    .replaceAll(rgx.two_spaces, "&#160;" ~ "&#160;" ~ "&#160;" ~ "&#160;")
+    .replaceAll(rgx.nbsp_and_space, "&#160;" ~ "&#160;")
     .replaceAll(rgx.strip_br, "");
   string o;
   if (obj.obj_cite_number.empty) {
@@ -1084,8 +1216,8 @@ auto verse_seg(O)(
     ) {
       string _txt = obj.text;
       _txt = (_txt)
-        .replaceAll(rgx.newline, "<br>\n")
-        .replaceAll(rgx.nbsp_char, "&nbsp;");
+        .replaceAll(rgx.newline, "<br />\n")
+        .replaceAll(rgx.nbsp_char, "&#160;");
       string o;
       if (obj.obj_cite_number.empty) {
           o = format(q"¶  <div class="substance">
@@ -1388,7 +1520,7 @@ void scroll_write_output(Fn,C)(
   Fn fn_src,
   C doc,
 ) {
-  debug(asserts){
+  debug(asserts) {
     static assert(is(typeof(fn_src) == string));
     static assert(is(typeof(doc)    == string[]));
   }
@@ -1636,7 +1768,7 @@ void seg_write_output(M,D,E)(
   D doc_html,
   E doc_html_endnotes,
 ) {
-  debug(asserts){
+  debug(asserts) {
     static assert(is(typeof(doc_html)      == string[][string]));
   }
   mixin SiSUoutputRgxInit;
@@ -2523,104 +2655,225 @@ auto css_write() {
 #+END_SRC
 
 *** _epub_ [#B]                                                        :epub:
+
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| function              | filename                 | module                    | variable                         |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| identify doc filetype | mimetype                 | epub3_mimetypes           | mimetypes                        |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| identify doc root     | META-INF/container.xml   | epub3_container_xml       | meta_inf_container_xml           |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| doc manifest          | OEBPS/content.opf        | epub3_oebps_content       | oebps_content_opf                |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| doc navigation        | OEBPS/toc_nav.xhtml      | epub3_oebps_toc_nav_xhtml | oebps_toc_nav_xhtml              |
+|                       | OEBPS/toc.ncx            | epub2_oebps_toc_ncx       | oebps_toc_ncx                    |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+| doc contents          | OEBPS/[files ... ].xhtml | outputEPub3               | doc_epub3[seg_filename]          |
+|                       |                          |                           | doc_epub3_endnotes[seg_filename] |
+|-----------------------+--------------------------+---------------------------+----------------------------------|
+
 **** template                                                   :template:
 
-#+BEGIN_SRC d :tangle ../src/sdp/output_epub.d
-template outputEPub() {
+#+BEGIN_SRC d :tangle ../src/sdp/output_epub3.d
+template outputEPub3() {
   <<output_imports>>
   mixin InternalMarkup;
   mixin outputXHTMLs;
-  <<output_epub_fixed>>
-  <<output_epub_constructs>>
-  <<output_epub_xhtml>>
-  <<output_epub_xhtml_seg>>
-  <<output_epub_css>>
+  <<output_epub3_fixed>>
+  <<output_epub3_constructs>>
+  <<output_epub3_xhtml>>
+  <<output_epub3_xhtml_seg>>
+  <<output_epub3_css>>
 }
 #+END_SRC
 
-**** epub special files                                           :format:
-***** static
-****** mimetype (file)
+**** special (epub) files                                         :format:
+***** DONE static
+****** _identify doc filetype_ (mimetype) [static]
+
+- mimetype file indicating that zip file contains an EPUB
 
-#+name: output_epub_fixed
+#+name: output_epub3_fixed
 #+BEGIN_SRC d
-string epub_mimetypes() {
+string epub3_mimetypes() {
   string o;
-  o = format(q"¶application/epub+zip¶");
+  o = format(q"¶application/epub+zip¶") ~ "\n";
   return o;
 }
 #+END_SRC
 
-****** META-INF/container.xml (file)
+****** _identify doc root_ (META-INF/container.xml) [static] rootfile: contains document root path
 
-#+name: output_epub_fixed
+- identifies the root package document (so systems can find it), [unchanged from epub2]
+
+#+name: output_epub3_fixed
 #+BEGIN_SRC d
-string epub_container_xml() {
+string epub3_container_xml() {
   string o;
-  o = format(q"¶<?xml version='1.0' encoding='utf-8'?>
-<container version="1.0"
-  xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
-  <rootfiles>
-    <rootfile full-path="OEBPS/content.opf"
-      media-type="application/oebps-package+xml" />
-  </rootfiles>
-</container>¶");
+  o = format(q"¶<?xml version='1.0' encoding='utf-8'?>¶") ~ "\n";
+  o ~= format(q"¶<container version="1.0"
+xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
+<rootfiles>
+  <rootfile full-path="OEBPS/content.opf"
+    media-type="application/oebps-package+xml" />
+</rootfiles>¶") ~ "\n</container>\n";
   return o;
 }
 #+END_SRC
 
-***** constructs (in OEBPS)
-****** TODO OEBPS/content.opf (register content: files, images etc.)
+***** constructs (in dir: OEBPS)
+****** TODO _doc manifest_ (OEBPS/content.opf) manifest, register content: files, images etc.
+
+- manifest, listing all resources
+- provides the default reading order
+- identifies the navigation document
 
-#+name: output_epub_constructs
+#+name: output_epub3_constructs
 #+BEGIN_SRC d
-string epub_oebps_content(D,I)(D doc_abstraction, I doc_matters) {
-  string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
-  string content = format(q"¶<?xml version='1.0' encoding='utf-8'?>
-<?xml version='1.0' encoding='utf-8'?>
+string epub3_oebps_content(D,I,P)(D doc_abstraction, I doc_matters, P parts) {
+  string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO sort uuid in doc_matters!
+  string content = format(q"¶  <?xml version='1.0' encoding='utf-8'?>
 <package xmlns="http://www.idpf.org/2007/opf" version="2.0" unique-identifier="EPB-UUID">
-  <opf:metadata
+  <metadata
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xmlns:opf="http://www.idpf.org/2007/opf"
     xmlns:dcterms="http://purl.org/dc/terms/"
     xmlns:dc="http://purl.org/dc/elements/1.1/"
     unique-identifier="urn:uuid:%s" version="2.0">
-    <dc:title>%s</dc:title>
-    <dc:creator opf:file-as="%s" opf:role="aut">%s</dc:creator>
-    <dc:language>en</dc:language>
-    <dc:date opf:event="published">%s</dc:date>
+    <!-- <dc:title id="title">%s</dc:title> -->
+    <dc:title id="title">%s</dc:title>
+    <meta refines="#title" property="title-type">main</meta>
+    <dc:title id="subtitle">%s</dc:title>
+    <meta refines="#subtitle" property="title-type">subtitle</meta>
+    <dc:creator file-as="%s" id="aut">%s</dc:creator>
+    <dc:language>%s</dc:language>
+    <dc:date id="published">%s</dc:date>
     <dc:rights>Copyright: %s</dc:rights>
-    <dc:identifier opf:scheme="URI">ox/current/en/epub/sisu_markup.epub</dc:identifier>
+    <dc:identifier scheme="URI">%s</dc:identifier>
     <dc:identifier id="bookid">urn:uuid:%s</dc:identifier>
     <!-- <dc:identifier id="EPB-UUID">urn:uuid:%s</dc:identifier> -->
-  </opf:metadata>
+  </metadata>
   <manifest>
-    <!-- NCX -->
-    <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
+    <!-- NCX epub2 navigation -->
+      <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
     <!-- CSS Style Sheets -->
-    <item id="main-css" href="css/xhtml.css" media-type="text/css" />¶",
+      <item id="main-css" href="css/xhtml.css" media-type="text/css" />
+    <!-- nav epub3 navigation -->
+      <item id="nav" href="toc_nav.xhtml" media-type="application/xhtml+xml" properties="nav" />
+¶",
+    uuid,
+    doc_matters.dochead_meta["title"]["full"],
+    doc_matters.dochead_meta["title"]["main"],
+    (doc_matters.dochead_meta["title"]["sub"].empty)
+      ? "" : doc_matters.dochead_meta["title"]["sub"],
+    (doc_matters.dochead_meta["creator"]["author"].empty)
+      ? "" : doc_matters.dochead_meta["creator"]["author"],
+    (doc_matters.dochead_meta["creator"]["author"].empty)
+      ? "" : doc_matters.dochead_meta["creator"]["author"],
+    doc_matters.language,
+    (doc_matters.dochead_meta["date"]["published"].empty)
+      ? "" : doc_matters.dochead_meta["date"]["published"],
+    (doc_matters.dochead_meta["rights"]["copyright"].empty)
+      ? "" : doc_matters.dochead_meta["rights"]["copyright"],
     uuid,
-    doc_matters.dochead_meta["title"]["full"],                                                               // title
-    (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
-    (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
-    (doc_matters.dochead_meta["date"]["published"].empty) ? "" : " by " ~ doc_matters.dochead_meta["date"]["published"],  // date
-    (doc_matters.dochead_meta["rights"]["copyright"].empty) ? "" : " by " ~ doc_matters.dochead_meta["rights"]["copyright"],  // rights
     uuid,
     uuid,
   );
+  content ~= "    " ~ "<!-- Content Documents -->" ~ "\n  ";
+  content ~= parts["manifest_documents"];
+  // TODO sort jpg & png
+  content ~= "    " ~ "<!-- Images -->" ~ "\n  ";
+  foreach (image; doc_matters.image_list) {
+    content ~= format(q"¶      <item id="%s" href="image/%s" media-type="image/png" />
+¶",
+      image,                        // strip image type, remove .png .jpg suffix, use in media-type="image/"
+      image,
+    );
+  }
+  content ~= "  " ~ "</manifest>"         ~ "\n  ";
+  content ~= "  " ~ "<spine toc=\"ncx\">" ~ "\n  ";
+  content ~= parts["spine"];
+  content ~= "  " ~ "</spine>"            ~ "\n  ";
+  content ~= "  " ~ "<guide>"             ~ "\n  ";
+  content ~= parts["guide"];
+  content ~= "  " ~ "</guide>"            ~ "\n  ";
+  content ~= ""   ~ "</package>";
+  return content;
+}
+#+END_SRC
+
+****** _doc navigation epub3_ (OEBPS/toc_nav.xhtml) epub3 navigable toc using Dom structure
+
+- toc_nav.xhtml declared as nav file in content.opf (epub3 navigation document)
+
+#+name: output_epub3_constructs
+#+BEGIN_SRC d
+string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
+  enum DomTags { none, open, close, close_and_open, open_still, }
+  auto markup = InlineMarkup();
+  string toc ="<nav epub:type=\"toc\" id=\"toc\">\n";
   foreach (sect; doc_matters.keys_seq_seg) {
     foreach (obj; doc_abstraction[sect]) {
+      if (obj.is_a == "heading") {
+        foreach_reverse (n; 0 .. 7) {
+          string k = n.to!string;
+          switch (obj.dom_collapsed[n]) {
+          case DomTags.close :
+            toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "</li>" ~ "\n";
+            toc ~= markup.indent_by_spaces_provided(n, "  ") ~ "</ol>" ~ "\n";
+            break;
+          case DomTags.close_and_open :
+            toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "</li>" ~ "\n";
+            if  (obj.dom_markedup[n] < 4) {
+              toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+              ~ markup.indent_by_spaces_provided((n + 2), "  ")
+              ~ "<span class=\"navhd\">" ~ obj.text ~ "</span>" ~ "\n";
+            } else {
+              string hashtag =(obj.heading_lev_markup == 4)
+              ? ""
+              : ("#" ~ obj.ocn.to!string);
+              toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+              ~ markup.indent_by_spaces_provided((n + 2), "  ")
+              ~ "<a href=\"" ~ obj.segment_anchor_tag ~ ".xhtml" ~ hashtag ~ "\">"
+              ~ obj.text
+              ~ "</a>" ~ "\n";
+            }
+            break;
+          case DomTags.open :
+            toc ~= markup.indent_by_spaces_provided(n, "  ") ~ "<ol>" ~ "\n";
+            if  (obj.dom_markedup[n] < 4) {
+              toc ~= markup.indent_by_spaces_provided(n, "  ")
+              ~ "<li><span class=\"navhd\">" ~ obj.text ~ "</span>" ~ "\n";
+            } else {
+              string hashtag =(obj.heading_lev_markup == 4)
+              ? ""
+              : ("#" ~ obj.ocn.to!string);
+              toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+              ~ markup.indent_by_spaces_provided((n + 2), "  ")
+              ~ "<a href=\"" ~ obj.segment_anchor_tag ~ ".xhtml" ~ hashtag ~ "\">"
+              ~ obj.text
+              ~ "</a>" ~ "\n";
+            }
+            break;
+          default :
+            break;
+          }
+        }
+      }
     }
   }
-  return content;
+  toc ~="</nav>\n";
+  return toc;
 }
 #+END_SRC
 
-****** TODO OEBPS/toc.ncx (navigable toc using Dom structure)
+****** TODO _doc navigation epub2_ (OEBPS/toc.ncx) navigable toc using Dom structure
 
-#+name: output_epub_constructs
+- toc.ncx (epub2 navigation document)
+  - (replaced in epub3 by a declared xhtml nav file, in our case toc_nav.xhtml)
+
+#+name: output_epub3_constructs
 #+BEGIN_SRC d
-string epub_oebps_toc(D,I)(D doc_abstraction, I doc_matters) {
+string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
   int counter = 0;
   string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
   auto markup = InlineMarkup();
@@ -2698,27 +2951,24 @@ obj.segment_anchor_tag,   // lev < 4 [no link]; lev == 4 [filename] markup.xhtml
 }
 #+END_SRC
 
-**** seg                                                             :seg:
-***** switch (sections & objects) format epub xhtml output
+**** the document contents                                           :seg:
+***** switch (sections & objects) format epub3 xhtml output
 
-#+name: output_epub_xhtml_seg
+#+name: output_epub3_xhtml_seg
 #+BEGIN_SRC d
-void outputEPub(D,I)(
+void outputEPub3(D,I)(
   auto return ref const D    doc_abstraction,
   auto return ref I          doc_matters,
 ) {
   mixin SiSUoutputRgxInit;
   auto xhtml_format = outputXHTMLs();
   auto rgx = Rgx();
-  string[][string] doc_epub;
-  string[][string] doc_epub_endnotes;
+  string[][string] doc_epub3;
+  string[][string] doc_epub3_endnotes;
   string[] doc;
   string segment_filename;
   string[] top_level_headings = ["","","",""];
-  auto mimetypes = epub_mimetypes;
-  auto meta_inf_container_xml = epub_container_xml;
-  auto oebps_toc_ncx = epub_oebps_toc(doc_abstraction, doc_matters);
-  auto oebps_content_opf = epub_oebps_content(doc_abstraction, doc_matters);
+  string[string] oepbs_content_parts;
   string suffix = ".xhtml";
   foreach (part; doc_matters.keys_seq_seg) {
     foreach (obj; doc_abstraction[part]) {
@@ -2753,18 +3003,18 @@ void outputEPub(D,I)(
           break;
         case 4:
           segment_filename = obj.segment_anchor_tag;
-          doc_epub[segment_filename] ~= xhtml_format.seg_head(doc_matters.dochead_meta);
+          doc_epub3[segment_filename] ~= xhtml_format.seg_head(doc_matters.dochead_meta);
           foreach (top_level_heading; top_level_headings) {
-            doc_epub[segment_filename] ~= top_level_heading;
+            doc_epub3[segment_filename] ~= top_level_heading;
           }
           auto t = xhtml_format.heading_seg(obj, suffix);
-          doc_epub[segment_filename] ~= t[0];
-          doc_epub_endnotes[segment_filename] ~= t[1];
+          doc_epub3[segment_filename] ~= t[0];
+          doc_epub3_endnotes[segment_filename] ~= t[1];
           break;
         case 5: .. case 7:
           auto t = xhtml_format.heading_seg(obj, suffix);
-          doc_epub[segment_filename] ~= t[0];
-          doc_epub_endnotes[segment_filename] ~= t[1];
+          doc_epub3[segment_filename] ~= t[0];
+          doc_epub3_endnotes[segment_filename] ~= t[1];
           break;
         case 8: .. case 9: // unused numbers, if remain check
           if ((doc_matters.opt_action_bool["debug"])) {
@@ -2785,7 +3035,7 @@ void outputEPub(D,I)(
           case "para":
             switch (obj.is_a) {
             case "toc":
-              doc_epub[segment_filename] ~= xhtml_format.toc(obj);
+              doc_epub3[segment_filename] ~= xhtml_format.toc(obj);
               break;
             default:
               if ((doc_matters.opt_action_bool["debug"])) {
@@ -2807,8 +3057,8 @@ void outputEPub(D,I)(
             switch (obj.is_a) {
             case "para":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             default:
               if ((doc_matters.opt_action_bool["debug"])) {
@@ -2821,33 +3071,33 @@ void outputEPub(D,I)(
             switch (obj.is_a) {
             case "quote":
               auto t = xhtml_format.quote_seg(obj, suffix);
-              doc_epub[segment_filename] ~= to!string(t[0]);
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= to!string(t[0]);
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "group":
               auto t = xhtml_format.group_seg(obj, suffix);
-              doc_epub[segment_filename] ~= to!string(t[0]);
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= to!string(t[0]);
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "block":
               auto t = xhtml_format.block_seg(obj, suffix);
-              doc_epub[segment_filename] ~= to!string(t[0]);
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= to!string(t[0]);
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "poem":
               break;
             case "verse":
               auto t = xhtml_format.verse_seg(obj, suffix);
-              doc_epub[segment_filename] ~= to!string(t[0]);
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= to!string(t[0]);
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "code":
-              doc_epub[segment_filename] ~= xhtml_format.code(obj);
+              doc_epub3[segment_filename] ~= xhtml_format.code(obj);
               break;
             case "table":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             default:
               if ((doc_matters.opt_action_bool["debug"])) {
@@ -2869,27 +3119,27 @@ void outputEPub(D,I)(
             switch (obj.is_a) {
             case "endnote":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
+              doc_epub3[segment_filename] ~= t[0];
               break;
             case "glossary":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "bibliography":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "bookindex":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             case "blurb":
               auto t = xhtml_format.para_seg(obj, suffix);
-              doc_epub[segment_filename] ~= t[0];
-              doc_epub_endnotes[segment_filename] ~= t[1];
+              doc_epub3[segment_filename] ~= t[0];
+              doc_epub3_endnotes[segment_filename] ~= t[1];
               break;
             default:
               if ((doc_matters.opt_action_bool["debug"])) {
@@ -2914,14 +3164,59 @@ void outputEPub(D,I)(
           break;
         }
       }
+      if (obj.is_a == "heading") {
+        if (obj.heading_lev_markup == 4) {
+          oepbs_content_parts["manifest_documents"] ~= format(q"¶      <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
+¶",
+            obj.segment_anchor_tag,
+            obj.segment_anchor_tag,
+          );
+          oepbs_content_parts["spine"] ~= format(q"¶    <itemref idref="%s.xhtml" linear="yes" />
+¶",
+            obj.segment_anchor_tag,
+          );
+          oepbs_content_parts["guide"] ~= format(q"¶      <reference type="%s" href="%s" />
+¶",
+            obj.segment_anchor_tag,
+            obj.segment_anchor_tag,
+          );
+        } else if (obj.heading_lev_markup > 4) {
+          oepbs_content_parts["manifest_documents"] ~= format(q"¶      <item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
+¶",
+            obj.segment_anchor_tag,
+            obj.obj_cite_number,
+            obj.segment_anchor_tag,
+            obj.obj_cite_number,
+          );
+          oepbs_content_parts["spine"] ~= format(q"¶    <itemref idref="%s.xhtml#%s" linear="yes" />
+¶",
+            obj.segment_anchor_tag,
+            obj.obj_cite_number,
+          );
+          oepbs_content_parts["guide"] ~= format(q"¶      <reference type="%s#%s" href="%s#%s" />
+¶",
+            obj.segment_anchor_tag,
+            obj.obj_cite_number,
+            obj.segment_anchor_tag,
+            obj.obj_cite_number,
+          );
+        }
+      }
     }
   }
-  epub_write_output_files(
+  /+ epub specific documents +/
+  auto mimetypes = epub3_mimetypes;
+  auto meta_inf_container_xml = epub3_container_xml;
+  auto oebps_toc_ncx = epub2_oebps_toc_ncx(doc_abstraction, doc_matters);
+  auto oebps_toc_nav_xhtml = epub3_oebps_toc_nav_xhtml(doc_abstraction, doc_matters);
+  auto oebps_content_opf = epub3_oebps_content(doc_abstraction, doc_matters, oepbs_content_parts);
+  epub3_write_output_files(
     doc_matters,
-    doc_epub,
-    doc_epub_endnotes,
+    doc_epub3,
+    doc_epub3_endnotes,
     mimetypes,
     meta_inf_container_xml,
+    oebps_toc_nav_xhtml,
     oebps_toc_ncx,
     oebps_content_opf,
   );
@@ -2930,71 +3225,214 @@ void outputEPub(D,I)(
 
 **** write output files
 
-#+name: output_epub_xhtml_seg
+#+name: output_epub3_xhtml_seg
 #+BEGIN_SRC d
-void epub_write_output_files(M,D,E,Mt,Mic,Ot,Oc)(
+void epub3_write_output_files(M,D,E,Mt,Mic,Otnx,Otn,Oc)(
   M    doc_matters,
-  D    doc_epub,
-  E    doc_epub_endnotes,
+  D    doc_epub3,
+  E    doc_epub3_endnotes,
   Mt   mimetypes,
   Mic  meta_inf_container_xml,
-  Ot   oebps_toc_ncx,
+  Otnx oebps_toc_nav_xhtml,
+  Otn  oebps_toc_ncx,
   Oc   oebps_content_opf,
 ) {
-  debug(asserts){
-    static assert(is(typeof(doc_epub)               == string[][string]));
+  debug(asserts) {
+    static assert(is(typeof(doc_epub3)              == string[][string]));
     static assert(is(typeof(mimetypes)              == string));
     static assert(is(typeof(meta_inf_container_xml) == string));
+    static assert(is(typeof(oebps_toc_nav_xhtml)    == string));
     static assert(is(typeof(oebps_toc_ncx)          == string));
     static assert(is(typeof(oebps_content_opf)      == string));
   }
   mixin SiSUpaths;
-  auto pth_epub = EpubPaths();
+  auto pth_epub3 = Epub3paths();
   auto xhtml_format = outputXHTMLs();
+  /+ zip file +/
+  auto fn_epub = pth_epub3.epub_file(doc_matters.source_filename);
+  auto zip = new ZipArchive(); // ZipArchive zip = new ZipArchive();
+  /+ zip archive member files +/
   try {
-    if (!exists(pth_epub.doc_meta_inf(doc_matters.source_filename))) {
-      pth_epub.doc_meta_inf(doc_matters.source_filename).mkdirRecurse;
+    if (!exists(pth_epub3.doc_meta_inf(doc_matters.source_filename))) {
+      pth_epub3.doc_meta_inf(doc_matters.source_filename).mkdirRecurse;
     }
-    if (!exists(pth_epub.doc_oebps_css(doc_matters.source_filename))) {
-      pth_epub.doc_oebps_css(doc_matters.source_filename).mkdirRecurse;
+    if (!exists(pth_epub3.doc_oebps_css(doc_matters.source_filename))) {
+      pth_epub3.doc_oebps_css(doc_matters.source_filename).mkdirRecurse;
     }
-    if (!exists(pth_epub.doc_oebps_image(doc_matters.source_filename))) {
-      pth_epub.doc_oebps_image(doc_matters.source_filename).mkdirRecurse;
+    if (!exists(pth_epub3.doc_oebps_image(doc_matters.source_filename))) {
+      pth_epub3.doc_oebps_image(doc_matters.source_filename).mkdirRecurse;
     }
-    /+ OEBPS/[segments].xhtml +/
-    foreach (seg_filename; doc_matters.segnames) {
-      auto f = File(pth_epub.fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename), "w");
-      /+ // f.writeln(seg_head); // not needed built and inserted earlier +/
-      foreach (docseg; doc_epub[seg_filename]) {
-        f.writeln(docseg);
+    { /+ OEBPS/[segments].xhtml (the document contents) +/
+      foreach (seg_filename; doc_matters.segnames) {
+        string fn = pth_epub3.fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add seg fn to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        debug(epub_output) {
+          string fn_dbg = pth_epub3.dbg_fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename);
+          auto f = File(fn_dbg, "w");
+        }
+        /+ // f.writeln(seg_head); // not needed built and inserted earlier +/
+        foreach (docseg; doc_epub3[seg_filename]) {
+          debug(epub_output) { f.writeln(docseg); }
+          zip_data.write(docseg.dup); // cast as: char[]
+        }
+        foreach (docseg; doc_epub3_endnotes[seg_filename]) {
+          debug(epub_output) { f.writeln(docseg); }
+          zip_data.write(docseg.dup); // cast as: char[]
+        }
+        debug(epub_output) { f.writeln(xhtml_format.tail); } // needed for each lev4
+        zip_data.write(xhtml_format.tail.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
       }
-      foreach (docseg; doc_epub_endnotes[seg_filename]) {
-        f.writeln(docseg);
+    }
+    string fn;
+    debug(epub_output) { string fn_dbg; }
+    File f;
+    { /+ mimetypes (identify zip file type) +/
+      debug(epub_output) {
+        fn_dbg = pth_epub3.dbg_fn_mimetypes(doc_matters.source_filename);
+        File(fn_dbg, "w").writeln(mimetypes);
       }
-      f.writeln(xhtml_format.tail); // needed for each lev4
+      fn = pth_epub3.fn_mimetypes(doc_matters.source_filename);
+      /+ add zip archive file members (with their content) +/
+      auto zip_arc_member_file = new ArchiveMember();
+      // add mimetypes to zip archive
+      zip_arc_member_file.name = fn;
+      auto zip_data = new OutBuffer();
+      zip_data.write(mimetypes.dup); // cast as: char[]
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      /+ create the zip file +/
+      createZipFile!()(fn_epub, zip.build());
+    }
+    { /+  META-INF/container.xml (identify doc root) +/
+      debug(epub_output) {
+        fn_dbg = pth_epub3.dbg_fn_dmi_container_xml(doc_matters.source_filename);
+        File(fn_dbg, "w").writeln(meta_inf_container_xml);
+      }
+      fn = pth_epub3.fn_dmi_container_xml(doc_matters.source_filename);
+      /+ add zip archive file members (with their content) +/
+      auto zip_arc_member_file = new ArchiveMember();
+      // add META-INF/container.xml to zip archive
+      zip_arc_member_file.name = fn;
+      auto zip_data = new OutBuffer();
+      zip_data.write(meta_inf_container_xml.dup); // cast as: char[]
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      /+ create the zip file +/
+      createZipFile!()(fn_epub, zip.build());
+    }
+    { /+ OEBPS/toc_nav.xhtml (navigation toc epub3) +/
+      debug(epub_output) {
+        fn_dbg = pth_epub3.dbg_fn_oebps_toc_nav_xhtml(doc_matters.source_filename);
+        File(fn_dbg, "w").writeln(oebps_toc_nav_xhtml);
+      }
+      fn = pth_epub3.fn_oebps_toc_nav_xhtml(doc_matters.source_filename);
+      /+ add zip archive file members (with their content) +/
+      auto zip_arc_member_file = new ArchiveMember();
+      // add OEBPS/toc_nav.xhtml to zip archive
+      zip_arc_member_file.name = fn;
+      auto zip_data = new OutBuffer();
+      zip_data.write(oebps_toc_nav_xhtml.dup); // cast as: char[]
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      /+ create the zip file +/
+      createZipFile!()(fn_epub, zip.build());
+    }
+    { /+ TODO OEBPS/toc.ncx (navigation toc epub2) +/
+      debug(epub_output) {
+        fn_dbg = pth_epub3.dbg_fn_oebps_toc_ncx(doc_matters.source_filename);
+        File(fn_dbg, "w").writeln(oebps_toc_ncx);
+      }
+      fn = pth_epub3.fn_oebps_toc_ncx(doc_matters.source_filename);
+      /+ add zip archive file members (with their content) +/
+      auto zip_arc_member_file = new ArchiveMember();
+      // add OEBPS/toc.ncx to zip archive
+      zip_arc_member_file.name = fn;
+      auto zip_data = new OutBuffer();
+      zip_data.write(oebps_toc_ncx.dup); // cast as: char[]
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      /+ create the zip file +/
+      createZipFile!()(fn_epub, zip.build());
     }
-    /+ mimetypes +/
-    auto f = File(pth_epub.fn_mimetypes(doc_matters.source_filename), "w");
-    f.writeln(mimetypes);
-    /+  META-INF/container.xml +/
-    f = File(pth_epub.fn_dmi_container_xml(doc_matters.source_filename), "w");
-    f.writeln(meta_inf_container_xml);
-    /+ OEBPS/toc.ncx +/
-    f = File(pth_epub.fn_oebps_toc_ncx(doc_matters.source_filename), "w");
-    f.writeln(oebps_toc_ncx);
-    /+ OEBPS/content.opf +/
-    f = File(pth_epub.fn_oebps_content_opf(doc_matters.source_filename), "w");
-    f.writeln(oebps_content_opf);
-    foreach (image; doc_matters.image_list) {
-      if (exists("_sisu/image/"~ image)) {
-        ("_sisu/image/"~ image)
-        .copy((pth_epub.doc_oebps_image(doc_matters.source_filename)) ~ "/" ~ image);
+    { /+ TODO OEBPS/content.opf (doc manifest) +/
+      debug(epub_output) {
+        fn_dbg = pth_epub3.dbg_fn_oebps_content_opf(doc_matters.source_filename);
+        File(fn_dbg, "w").writeln(oebps_content_opf);
+      }
+      fn = pth_epub3.fn_oebps_content_opf(doc_matters.source_filename);
+      /+ add zip archive file members (with their content) +/
+      auto zip_arc_member_file = new ArchiveMember();
+      // add OEBPS/content.opf to zip archive
+      zip_arc_member_file.name = fn;
+      auto zip_data = new OutBuffer();
+      zip_data.write(oebps_content_opf.dup); // cast as: char[]
+      zip_arc_member_file.expandedData = zip_data.toBytes();
+      zip.addMember(zip_arc_member_file);
+      /+ create the zip file +/
+      createZipFile!()(fn_epub, zip.build());
+    }
+    { /+ OEBPS/_sisu/image (images) +/
+      foreach (image; doc_matters.image_list) {
+        if (exists("_sisu/image/"~ image)) {
+          ("_sisu/image/"~ image)
+          .copy((pth_epub3.doc_oebps_image(doc_matters.source_filename)) ~ "/" ~ image);
+        }
+      }
+      foreach (image; doc_matters.image_list) {
+        debug(epub_images) {
+          writeln(
+            "_sisu/image/", image, " -> ",
+            pth_epub3.doc_oebps_image(doc_matters.source_filename), "/", image
+          );
+        }
+        auto fn_src = "_sisu/image/"~ image;
+        auto fn_out =  pth_epub3.doc_oebps_image(doc_matters.source_filename).to!string ~ "/" ~ image;
+        if (exists(fn_src)) {
+          {
+            auto zip_arc_member_file = new ArchiveMember();
+            zip_arc_member_file.name = fn_out;
+            auto zip_data = new OutBuffer();
+            zip_data.write(cast(char[]) ((fn_src).read));
+            zip_arc_member_file.expandedData = zip_data.toBytes();
+            zip.addMember(zip_arc_member_file);
+            createZipFile!()(fn_epub, zip.build());
+          }
+        }
       }
     }
   }
   catch (ErrnoException ex) {
     // Handle error
   }
+#+END_SRC
+
+*** zip debug, read zip  archive
+
+#+name: output_epub3_xhtml_seg
+#+BEGIN_SRC d
+  debug(epub_archive) {
+    if (exists(fn_epub)) {
+      try {
+        auto zipped = new ZipArchive((fn_epub).read);
+        foreach (filename, member; zipped.directory) {
+          auto data = zipped.expand(member);
+          writeln(filename, " length ", data.length); // member.name
+          // Use data
+        }
+      }
+      catch (ZipException ex) {
+        // Handle errors
+      }
+    }
+  }
 }
 #+END_SRC
 
diff --git a/org/sdp.org b/org/sdp.org
index ff989c9..6ef3d06 100644
--- a/org/sdp.org
+++ b/org/sdp.org
@@ -23,7 +23,7 @@ struct Version {
   int minor;
   int patch;
 }
-enum ver = Version(0, 13, 8);
+enum ver = Version(0, 13, 9);
 #+END_SRC
 
 * 1. sdp (sisu document parser)                                         :sdp:
@@ -72,9 +72,9 @@ void main(string[] args) {
 }
 unittest {
   /++
-	name        "sdp"
-	description "A SiSU document parser writen in D."
-	homepage    "http://sisudoc.org"
+  name        "sdp"
+  description "A SiSU document parser writen in D."
+  homepage    "http://sisudoc.org"
   +/
 }
 #+END_SRC
diff --git a/src/sdp.d b/src/sdp.d
index 4214e83..27b2d85 100755
--- a/src/sdp.d
+++ b/src/sdp.d
@@ -222,8 +222,8 @@ void main(string[] args) {
 }
 unittest {
   /++
-	name        "sdp"
-	description "A SiSU document parser writen in D."
-	homepage    "http://sisudoc.org"
+  name        "sdp"
+  description "A SiSU document parser writen in D."
+  homepage    "http://sisudoc.org"
   +/
 }
diff --git a/src/sdp/ao_defaults.d b/src/sdp/ao_defaults.d
index 846a7d2..21352e2 100644
--- a/src/sdp/ao_defaults.d
+++ b/src/sdp/ao_defaults.d
@@ -394,8 +394,7 @@ template InternalMarkup() {
     auto tc_o = "┏"; //"『"; // "┏" ┓
     auto tc_c = "┚"; // "』"; // "┚"  table row mark #Mx[:tc_c]="』\n"
     auto tc_p = "┆";   // table col/misc mark
-    string indent_by_spaces_provided(int indent) {
-      auto _indent_spaces ="░░";   // auto nbsp = "░";
+    string indent_by_spaces_provided(int indent, string _indent_spaces ="░░") {
       _indent_spaces = replicate(_indent_spaces, indent);
       return _indent_spaces;
     }
diff --git a/src/sdp/ao_doc_debugs.d b/src/sdp/ao_doc_debugs.d
index 989a826..05e3739 100644
--- a/src/sdp/ao_doc_debugs.d
+++ b/src/sdp/ao_doc_debugs.d
@@ -113,7 +113,7 @@ template SiSUdebugs() {
         }
       }
     }
-    debug(dom) {
+    debug(toc_nav_dom) {
       enum DomTags { none, open, close, close_and_open, open_still, }
       foreach (sect; doc_matters.keys_seq_seg) {
         foreach (obj; contents[sect]) {
@@ -125,10 +125,10 @@ template SiSUdebugs() {
                 break;
               case DomTags.close_and_open :
                 writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
-                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
                 break;
               case DomTags.open :
-                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
                 break;
               default :
                 break;
@@ -148,10 +148,10 @@ template SiSUdebugs() {
                 break;
               case DomTags.close_and_open :
                 writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
-                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
                 break;
               case DomTags.open :
-                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text);
+                writeln(markup.indent_by_spaces_provided(k), "<", k, ">", obj.text, " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
                 break;
               default :
                 break;
diff --git a/src/sdp/create_zip_file.d b/src/sdp/create_zip_file.d
new file mode 100644
index 0000000..6ea55f4
--- /dev/null
+++ b/src/sdp/create_zip_file.d
@@ -0,0 +1,16 @@
+template createZipFile() {
+  import std.file;
+  import std.outbuffer;
+  import std.string;
+  import std.zip;
+  void createZipFile(
+    string zip_file_name,
+    void[] compressed_zip_data,
+  ) {
+    try {
+      write(zip_file_name, compressed_zip_data);
+    } catch (ZipException ex) {
+      // Handle Errors
+    }
+  }
+}
diff --git a/src/sdp/defaults.d b/src/sdp/defaults.d
index a6520a3..537b4ba 100644
--- a/src/sdp/defaults.d
+++ b/src/sdp/defaults.d
@@ -3,103 +3,188 @@
 +/
 
 template SiSUpaths() {
-  string _base_filename(string fn_src) {
-    string _fn_base = "";
-    if (extension(fn_src) == ".sst") {
-      _fn_base = baseName(fn_src, ".sst");
-    } else if (extension(fn_src) == ".ssm") {
-      _fn_base = baseName(fn_src, ".ssm");
-    }
-    return _fn_base;
-  }
   struct DirPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
   }
   struct SiSUpodPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
+    }
+    string sisupod_filename(string fn_src) {
+      return "sisupod".chainPath(base_filename(fn_src) ~ ".zip").array;
+    }
+    string base(string fn_src) {
+      return "sisupod".chainPath(base_filename(fn_src)).array;
+    }
+  }
+  struct SiSUpodPathsZipped {
+    auto spod_pths = SiSUpodPaths();
+    string base_filename(string fn_src) {
+      return spod_pths.base_filename(fn_src);
+    }
+    string sisupod_filename(string fn_src) {
+      return spod_pths.sisupod_filename(fn_src);
+    }
+    string base(string fn_src) {
+      return spod_pths.base(fn_src);
+    }
+    auto doc_root(string fn_src) {
+      return "doc";
+    }
+    auto doc(string fn_src) {
+      return doc_root(fn_src);
+    }
+    auto doc_lng(string fn_src, string lng) {
+      return doc_root(fn_src).chainPath(lng).array;
+    }
+    auto conf(string fn_src) {
+      return doc_root(fn_src).chainPath("_sisu").array;
+    }
+    auto image(string fn_src) {
+      return conf(fn_src).chainPath("image").array;
+    }
+    auto css(string fn_src) {
+      return conf(fn_src).chainPath("css").array;
+    }
+    auto fn_doc(string fn_src, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_src)).array;
+    }
+    auto fn_doc_insert(string fn_src, string fn_insert, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_insert)).array;
+    }
+  }
+  struct SiSUpodPathsFilesystemArchive {
+    auto spod_pths = SiSUpodPaths();
+    string base_filename(string fn_src) {
+      return spod_pths.base_filename(fn_src);
+    }
+    string sisupod_filename(string fn_src) {
+      return spod_pths.sisupod_filename(fn_src);
     }
     string base(string fn_src) {
-      return chainPath("sisupod", _base_filename(fn_src)).array;
+      return spod_pths.base(fn_src);
+    }
+    auto doc_root(string fn_src) {
+      return base(fn_src).chainPath("doc").array;
     }
-    string doc(string fn_src) {
-      return chainPath(base(fn_src), "doc").array;
-      // return chainPath(base(fn_src), "text").array;
+    auto doc(string fn_src) {
+      return doc_root(fn_src);
     }
-    string doc_lng(string fn_src, string lng) {
-      return chainPath(doc(fn_src), lng).array;
+    auto doc_lng(string fn_src, string lng) {
+      return doc_root(fn_src).chainPath(lng).array;
     }
-    string conf(string fn_src) {
-      return chainPath(doc(fn_src), "_sisu").array;
+    auto conf(string fn_src) {
+      return doc_root(fn_src).chainPath("_sisu").array;
     }
-    string image(string fn_src) {
-      return chainPath(conf(fn_src), "image").array;
+    auto image(string fn_src) {
+      return conf(fn_src).chainPath("image").array;
     }
-    string css(string fn_src) {
-      return chainPath(conf(fn_src), "css").array;
+    auto css(string fn_src) {
+      return conf(fn_src).chainPath("css").array;
     }
-    string fn_doc(string fn_src, string lng) {
-      return chainPath((doc_lng(fn_src, lng)), baseName(fn_src)).array;
+    auto fn_doc(string fn_src, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_src)).array;
     }
-    string fn_doc_insert(string fn_src, string fn_insert, string lng) {
-      return chainPath((doc_lng(fn_src, lng)), baseName(fn_insert)).array;
+    auto fn_doc_insert(string fn_src, string fn_insert, string lng) {
+      return (doc_lng(fn_src, lng)).chainPath(baseName(fn_insert)).array;
     }
   }
   struct HtmlPaths {
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
     string base() {
-      return chainPath("en", "html").array;
+      return "en".chainPath("html").array;
     }
     string seg(string fn_src) {
-      return chainPath(base, _base_filename(fn_src)).array;
+      return base.chainPath(base_filename(fn_src)).array;
     }
     string fn_scroll(string fn_src) {
-      return chainPath(base, _base_filename(fn_src) ~ ".html").array;
+      return base.chainPath(base_filename(fn_src) ~ ".html").array;
     }
     string fn_seg(string fn_src, string seg_filename) {
-      return chainPath(seg(fn_src), seg_filename ~ ".html").array;
+      return seg(fn_src).chainPath(seg_filename ~ ".html").array;
     }
   }
-  struct EpubPaths {
+  struct Epub3paths {
+    string dirtop() {
+      return "".chainPath("").array;
+    }
     string base_filename(string fn_src) {
-      return _base_filename(fn_src);
+      return baseName(stripExtension(fn_src));
     }
     string base() {
-      return chainPath("en", "epub").array;
+      return "en".chainPath("epub3").array;
+    }
+    string epub_file(string fn_src) {
+      return base.chainPath(base_filename(fn_src) ~ ".epub").array;
     }
-    string doc(string fn_src) {
-      return chainPath(base, _base_filename(fn_src)).array;
+    string docdir(string fn_src) {
+      return base.chainPath(base_filename(fn_src)).array;
     }
     string doc_meta_inf(string fn_src) {
-      return chainPath(doc(fn_src), "META-INF").array;
+      return dirtop.chainPath("META-INF").array;
     }
     string doc_oebps(string fn_src) {
-      return chainPath(doc(fn_src), "OEBPS").array;
+      return dirtop.chainPath("OEBPS").array;
     }
     string doc_oebps_css(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "css").array;
+      return doc_oebps(fn_src).chainPath("css").array;
     }
     string doc_oebps_image(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "image").array;
+      return doc_oebps(fn_src).chainPath("image").array;
     }
     string fn_mimetypes(string fn_src) {
-      return chainPath(doc(fn_src), "mimetypes").array;
+      return dirtop.chainPath("mimetypes").array;
     }
     string fn_dmi_container_xml(string fn_src) {
-      return chainPath(doc_meta_inf(fn_src), "container.xml").array;
+      return doc_meta_inf(fn_src).chainPath("container.xml").array;
+    }
+    string fn_oebps_toc_nav_xhtml(string fn_src) {
+      return doc_oebps(fn_src).chainPath("toc_nav.xhtml").array;
     }
     string fn_oebps_toc_ncx(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "toc.ncx").array;
+      return doc_oebps(fn_src).chainPath("toc.ncx").array;
     }
     string fn_oebps_content_opf(string fn_src) {
-      return chainPath(doc_oebps(fn_src), "content.opf").array;
+      return doc_oebps(fn_src).chainPath("content.opf").array;
     }
     string fn_oebps_content_xhtml(string fn_src, string seg_filename) {
-      return chainPath(doc_oebps(fn_src), seg_filename ~ ".xhtml").array;
+      return doc_oebps(fn_src).chainPath(seg_filename ~ ".xhtml").array;
+    }
+    debug(epub_output) {
+      string dbg_doc_meta_inf(string fn_src) {
+        return docdir(fn_src).chainPath("META-INF").array;
+      }
+      string dbg_doc_oebps(string fn_src) {
+        return docdir(fn_src).chainPath("OEBPS").array;
+      }
+      string dbg_doc_oebps_css(string fn_src) {
+        return doc_oebps(fn_src).chainPath("css").array;
+      }
+      string dbg_doc_oebps_image(string fn_src) {
+        return doc_oebps(fn_src).chainPath("image").array;
+      }
+      string dbg_fn_mimetypes(string fn_src) {
+        return docdir(fn_src).chainPath("mimetypes").array;
+      }
+      string dbg_fn_dmi_container_xml(string fn_src) {
+        return doc_meta_inf(fn_src).chainPath("container.xml").array;
+      }
+      string dbg_fn_oebps_toc_nav_xhtml(string fn_src) {
+        return doc_oebps(fn_src).chainPath("toc_nav.xhtml").array;
+      }
+      string dbg_fn_oebps_toc_ncx(string fn_src) {
+        return doc_oebps(fn_src).chainPath("toc.ncx").array;
+      }
+      string dbg_fn_oebps_content_opf(string fn_src) {
+        return doc_oebps(fn_src).chainPath("content.opf").array;
+      }
+      string dbg_fn_oebps_content_xhtml(string fn_src, string seg_filename) {
+        return doc_oebps(fn_src).chainPath(seg_filename ~ ".xhtml").array;
+      }
     }
   }
 }
@@ -122,8 +207,7 @@ template InternalMarkup() {
     auto tc_o = "┏"; //"『"; // "┏" ┓
     auto tc_c = "┚"; // "』"; // "┚"  table row mark #Mx[:tc_c]="』\n"
     auto tc_p = "┆";   // table col/misc mark
-    string indent_by_spaces_provided(int indent) {
-      auto _indent_spaces ="░░";   // auto nbsp = "░";
+    string indent_by_spaces_provided(int indent, string _indent_spaces ="░░") {
       _indent_spaces = replicate(_indent_spaces, indent);
       return _indent_spaces;
     }
diff --git a/src/sdp/output_epub.d b/src/sdp/output_epub.d
deleted file mode 100644
index 0cc3a31..0000000
--- a/src/sdp/output_epub.d
+++ /dev/null
@@ -1,449 +0,0 @@
-template outputEPub() {
-  private import
-    std.algorithm,
-    std.array,
-    std.container,
-    std.exception,
-    std.file,
-    std.getopt,
-    std.json,
-    std.process,
-    std.stdio,
-    std.path,
-    std.range,
-    std.regex,
-    std.string,
-    std.traits,
-    std.typecons,
-    std.uni,
-    std.utf,
-    std.conv : to;
-  import
-    defaults,
-    output_rgx,
-    output_xhtmls;
-  mixin InternalMarkup;
-  mixin outputXHTMLs;
-  string epub_mimetypes() {
-    string o;
-    o = format(q"¶application/epub+zip¶");
-    return o;
-  }
-  string epub_container_xml() {
-    string o;
-    o = format(q"¶<?xml version='1.0' encoding='utf-8'?>
-  <container version="1.0"
-    xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
-    <rootfiles>
-      <rootfile full-path="OEBPS/content.opf"
-        media-type="application/oebps-package+xml" />
-    </rootfiles>
-  </container>¶");
-    return o;
-  }
-  string epub_oebps_content(D,I)(D doc_abstraction, I doc_matters) {
-    string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
-    string content = format(q"¶<?xml version='1.0' encoding='utf-8'?>
-  <?xml version='1.0' encoding='utf-8'?>
-  <package xmlns="http://www.idpf.org/2007/opf" version="2.0" unique-identifier="EPB-UUID">
-    <opf:metadata
-      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-      xmlns:opf="http://www.idpf.org/2007/opf"
-      xmlns:dcterms="http://purl.org/dc/terms/"
-      xmlns:dc="http://purl.org/dc/elements/1.1/"
-      unique-identifier="urn:uuid:%s" version="2.0">
-      <dc:title>%s</dc:title>
-      <dc:creator opf:file-as="%s" opf:role="aut">%s</dc:creator>
-      <dc:language>en</dc:language>
-      <dc:date opf:event="published">%s</dc:date>
-      <dc:rights>Copyright: %s</dc:rights>
-      <dc:identifier opf:scheme="URI">ox/current/en/epub/sisu_markup.epub</dc:identifier>
-      <dc:identifier id="bookid">urn:uuid:%s</dc:identifier>
-      <!-- <dc:identifier id="EPB-UUID">urn:uuid:%s</dc:identifier> -->
-    </opf:metadata>
-    <manifest>
-      <!-- NCX -->
-      <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
-      <!-- CSS Style Sheets -->
-      <item id="main-css" href="css/xhtml.css" media-type="text/css" />¶",
-      uuid,
-      doc_matters.dochead_meta["title"]["full"],                                                               // title
-      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
-      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
-      (doc_matters.dochead_meta["date"]["published"].empty) ? "" : " by " ~ doc_matters.dochead_meta["date"]["published"],  // date
-      (doc_matters.dochead_meta["rights"]["copyright"].empty) ? "" : " by " ~ doc_matters.dochead_meta["rights"]["copyright"],  // rights
-      uuid,
-      uuid,
-    );
-    foreach (sect; doc_matters.keys_seq_seg) {
-      foreach (obj; doc_abstraction[sect]) {
-      }
-    }
-    return content;
-  }
-  string epub_oebps_toc(D,I)(D doc_abstraction, I doc_matters) {
-    int counter = 0;
-    string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
-    auto markup = InlineMarkup();
-    enum DomTags { none, open, close, close_and_open, open_still, }
-    string toc = format(q"¶<?xml version='1.0' encoding='utf-8'?>
-  <ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1">
-    <head>
-      <!-- four required metadata items (for all NCX documents,
-        (including the relaxed constraints of OPS 2.0) -->
-      <title>%s%s</title>
-      <link href="css/xhtml.css" rel="stylesheet" type="text/css" id="main-css" />
-      <meta name="dtb:uid" content="urn:uuid:%s" />
-      <!-- <meta name="epub-creator" content="SiSU http://www.jus.uio.no/sisu (this copy)" /> -->
-      <meta name="dtb:depth" content="%s" />
-      <meta name="dtb:totalPageCount" content="0" />
-      <meta name="dtb:maxPageNumber" content="0" />
-    </head>
-    <docTitle>
-      <text>%s</text>
-    </docTitle>
-    <docAuthor>
-      <text>%s</text>
-    </docAuthor>
-    <navMap>¶",
-      doc_matters.dochead_meta["title"]["full"],                                                               // title
-      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
-      uuid,                                                                                        // uuid
-      "3",                                                                                         // content depth
-      doc_matters.dochead_meta["title"]["full"],                                                               // title
-      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : doc_matters.dochead_meta["creator"]["author"],          // author
-    );
-    foreach (sect; doc_matters.keys_seq_seg) {
-      foreach (obj; doc_abstraction[sect]) {
-        if (obj.is_a == "heading") {
-          foreach_reverse (k; 0 .. 7) {
-            switch (obj.dom_markedup[k]) {
-            case DomTags.close :
-  toc ~= "</navPoint>";
-              break;
-            case DomTags.close_and_open :
-              ++counter;
-  toc ~= "</navPoint>";
-  toc ~= format(q"¶<navPoint class="chapter" id="navpoint" playOrder="%s">
-  <navLabel>
-    <text>%s</text>
-  </navLabel>
-  <content src="%s" />¶",
-  counter,
-  obj.text,
-  obj.segment_anchor_tag,   // lev < 4 [no link]; lev == 4 [filename] markup.xhtml; lev > 4 [filename#ocn] (links done in segment_anchor_tag)
-  );
-              break;
-            case DomTags.open :
-              ++counter;
-  toc ~= format(q"¶<navPoint class="chapter" id="navpoint" playOrder="%s">
-  <navLabel>
-    <text>%s</text>
-  </navLabel>
-  <content src="%s" />¶",
-  counter,
-  obj.text,
-  obj.segment_anchor_tag,   // lev < 4 [no link]; lev == 4 [filename] markup.xhtml; lev > 4 [filename#ocn] (fix links in segment_anchor_tag)
-  );
-              break;
-            default :
-              break;
-            }
-          }
-        }
-      }
-    }
-    toc ~= format(q"¶  </navMap>
-  </ncx>¶");
-    return toc;
-  }
-  
-  void outputEPub(D,I)(
-    auto return ref const D    doc_abstraction,
-    auto return ref I          doc_matters,
-  ) {
-    mixin SiSUoutputRgxInit;
-    auto xhtml_format = outputXHTMLs();
-    auto rgx = Rgx();
-    string[][string] doc_epub;
-    string[][string] doc_epub_endnotes;
-    string[] doc;
-    string segment_filename;
-    string[] top_level_headings = ["","","",""];
-    auto mimetypes = epub_mimetypes;
-    auto meta_inf_container_xml = epub_container_xml;
-    auto oebps_toc_ncx = epub_oebps_toc(doc_abstraction, doc_matters);
-    auto oebps_content_opf = epub_oebps_content(doc_abstraction, doc_matters);
-    string suffix = ".xhtml";
-    foreach (part; doc_matters.keys_seq_seg) {
-      foreach (obj; doc_abstraction[part]) {
-        if (obj.is_a == "heading") {
-          switch (obj.heading_lev_markup) {
-          case 0: .. case 3:
-            /+ fill buffer, and replace with new levels from 1 to 3 +/
-            switch (obj.heading_lev_markup) {
-            case 0:
-              top_level_headings[0] = "";
-              top_level_headings[1] = "";
-              top_level_headings[2] = "";
-              top_level_headings[3] = "";
-              goto default;
-            case 1:
-              top_level_headings[1] = "";
-              top_level_headings[2] = "";
-              top_level_headings[3] = "";
-              goto default;
-            case 2:
-              top_level_headings[2] = "";
-              top_level_headings[3] = "";
-              goto default;
-            case 3:
-              top_level_headings[3] = "";
-              goto default;
-            default:
-              auto t = xhtml_format.heading_seg(obj, suffix);
-              top_level_headings[obj.heading_lev_markup] = t[0];
-              break;
-            }
-            break;
-          case 4:
-            segment_filename = obj.segment_anchor_tag;
-            doc_epub[segment_filename] ~= xhtml_format.seg_head(doc_matters.dochead_meta);
-            foreach (top_level_heading; top_level_headings) {
-              doc_epub[segment_filename] ~= top_level_heading;
-            }
-            auto t = xhtml_format.heading_seg(obj, suffix);
-            doc_epub[segment_filename] ~= t[0];
-            doc_epub_endnotes[segment_filename] ~= t[1];
-            break;
-          case 5: .. case 7:
-            auto t = xhtml_format.heading_seg(obj, suffix);
-            doc_epub[segment_filename] ~= t[0];
-            doc_epub_endnotes[segment_filename] ~= t[1];
-            break;
-          case 8: .. case 9: // unused numbers, if remain check
-            if ((doc_matters.opt_action_bool["debug"])) {
-              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
-              writeln(__FILE__, ":", __LINE__, ": ", obj.text); // check
-            }
-            break;
-          default:
-            if ((doc_matters.opt_action_bool["debug"])) {
-              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
-            }
-            break;
-          }
-        } else {
-          switch (obj.use) {
-          case "frontmatter":
-            switch (obj.is_of) {
-            case "para":
-              switch (obj.is_a) {
-              case "toc":
-                doc_epub[segment_filename] ~= xhtml_format.toc(obj);
-                break;
-              default:
-                if ((doc_matters.opt_action_bool["debug"])) {
-                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
-                }
-                break;
-              }
-              break;
-            default:
-              if ((doc_matters.opt_action_bool["debug"])) {
-                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
-              }
-              break;
-            }
-            break;
-          case "body":
-            switch (obj.is_of) {
-            case "para":
-              switch (obj.is_a) {
-              case "para":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              default:
-                if ((doc_matters.opt_action_bool["debug"])) {
-                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
-                }
-                break;
-              }
-              break;
-            case "block":
-              switch (obj.is_a) {
-              case "quote":
-                auto t = xhtml_format.quote_seg(obj, suffix);
-                doc_epub[segment_filename] ~= to!string(t[0]);
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "group":
-                auto t = xhtml_format.group_seg(obj, suffix);
-                doc_epub[segment_filename] ~= to!string(t[0]);
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "block":
-                auto t = xhtml_format.block_seg(obj, suffix);
-                doc_epub[segment_filename] ~= to!string(t[0]);
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "poem":
-                break;
-              case "verse":
-                auto t = xhtml_format.verse_seg(obj, suffix);
-                doc_epub[segment_filename] ~= to!string(t[0]);
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "code":
-                doc_epub[segment_filename] ~= xhtml_format.code(obj);
-                break;
-              case "table":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              default:
-                if ((doc_matters.opt_action_bool["debug"])) {
-                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
-                }
-                break;
-              }
-              break;
-            default:
-              if ((doc_matters.opt_action_bool["debug"])) {
-                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
-              }
-              break;
-            }
-            break;
-          case "backmatter":
-            switch (obj.is_of) {
-            case "para":
-              switch (obj.is_a) {
-              case "endnote":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                break;
-              case "glossary":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "bibliography":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "bookindex":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              case "blurb":
-                auto t = xhtml_format.para_seg(obj, suffix);
-                doc_epub[segment_filename] ~= t[0];
-                doc_epub_endnotes[segment_filename] ~= t[1];
-                break;
-              default:
-                if ((doc_matters.opt_action_bool["debug"])) {
-                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
-                }
-                break;
-              }
-              break;
-            default:
-              if ((doc_matters.opt_action_bool["debug"])) {
-                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
-              }
-              break;
-            }
-            break;
-          case "comment":
-            break;
-          default:
-            if ((doc_matters.opt_action_bool["debug"])) {
-              writeln(__FILE__, ":", __LINE__, ": ", obj.use);
-            }
-            break;
-          }
-        }
-      }
-    }
-    epub_write_output_files(
-      doc_matters,
-      doc_epub,
-      doc_epub_endnotes,
-      mimetypes,
-      meta_inf_container_xml,
-      oebps_toc_ncx,
-      oebps_content_opf,
-    );
-  }
-  void epub_write_output_files(M,D,E,Mt,Mic,Ot,Oc)(
-    M    doc_matters,
-    D    doc_epub,
-    E    doc_epub_endnotes,
-    Mt   mimetypes,
-    Mic  meta_inf_container_xml,
-    Ot   oebps_toc_ncx,
-    Oc   oebps_content_opf,
-  ) {
-    debug(asserts){
-      static assert(is(typeof(doc_epub)               == string[][string]));
-      static assert(is(typeof(mimetypes)              == string));
-      static assert(is(typeof(meta_inf_container_xml) == string));
-      static assert(is(typeof(oebps_toc_ncx)          == string));
-      static assert(is(typeof(oebps_content_opf)      == string));
-    }
-    mixin SiSUpaths;
-    auto pth_epub = EpubPaths();
-    auto xhtml_format = outputXHTMLs();
-    try {
-      if (!exists(pth_epub.doc_meta_inf(doc_matters.source_filename))) {
-        pth_epub.doc_meta_inf(doc_matters.source_filename).mkdirRecurse;
-      }
-      if (!exists(pth_epub.doc_oebps_css(doc_matters.source_filename))) {
-        pth_epub.doc_oebps_css(doc_matters.source_filename).mkdirRecurse;
-      }
-      if (!exists(pth_epub.doc_oebps_image(doc_matters.source_filename))) {
-        pth_epub.doc_oebps_image(doc_matters.source_filename).mkdirRecurse;
-      }
-      /+ OEBPS/[segments].xhtml +/
-      foreach (seg_filename; doc_matters.segnames) {
-        auto f = File(pth_epub.fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename), "w");
-        /+ // f.writeln(seg_head); // not needed built and inserted earlier +/
-        foreach (docseg; doc_epub[seg_filename]) {
-          f.writeln(docseg);
-        }
-        foreach (docseg; doc_epub_endnotes[seg_filename]) {
-          f.writeln(docseg);
-        }
-        f.writeln(xhtml_format.tail); // needed for each lev4
-      }
-      /+ mimetypes +/
-      auto f = File(pth_epub.fn_mimetypes(doc_matters.source_filename), "w");
-      f.writeln(mimetypes);
-      /+  META-INF/container.xml +/
-      f = File(pth_epub.fn_dmi_container_xml(doc_matters.source_filename), "w");
-      f.writeln(meta_inf_container_xml);
-      /+ OEBPS/toc.ncx +/
-      f = File(pth_epub.fn_oebps_toc_ncx(doc_matters.source_filename), "w");
-      f.writeln(oebps_toc_ncx);
-      /+ OEBPS/content.opf +/
-      f = File(pth_epub.fn_oebps_content_opf(doc_matters.source_filename), "w");
-      f.writeln(oebps_content_opf);
-      foreach (image; doc_matters.image_list) {
-        if (exists("_sisu/image/"~ image)) {
-          ("_sisu/image/"~ image)
-          .copy((pth_epub.doc_oebps_image(doc_matters.source_filename)) ~ "/" ~ image);
-        }
-      }
-    }
-    catch (ErrnoException ex) {
-      // Handle error
-    }
-  }
-  
-}
diff --git a/src/sdp/output_epub3.d b/src/sdp/output_epub3.d
new file mode 100644
index 0000000..f0ac2c3
--- /dev/null
+++ b/src/sdp/output_epub3.d
@@ -0,0 +1,717 @@
+template outputEPub3() {
+  private import
+    std.algorithm,
+    std.array,
+    std.container,
+    std.digest.sha,
+    std.exception,
+    std.file,
+    std.getopt,
+    std.json,
+    std.outbuffer,
+    std.path,
+    std.process,
+    std.range,
+    std.regex,
+    std.stdio,
+    std.string,
+    std.traits,
+    std.typecons,
+    std.uni,
+    std.utf,
+    std.zip,
+    std.conv : to;
+  import
+    create_zip_file,
+    defaults,
+    output_rgx,
+    output_xhtmls;
+  mixin InternalMarkup;
+  mixin outputXHTMLs;
+  string epub3_mimetypes() {
+    string o;
+    o = format(q"¶application/epub+zip¶") ~ "\n";
+    return o;
+  }
+  string epub3_container_xml() {
+    string o;
+    o = format(q"¶<?xml version='1.0' encoding='utf-8'?>¶") ~ "\n";
+    o ~= format(q"¶<container version="1.0"
+  xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
+  <rootfiles>
+    <rootfile full-path="OEBPS/content.opf"
+      media-type="application/oebps-package+xml" />
+  </rootfiles>¶") ~ "\n</container>\n";
+    return o;
+  }
+  string epub3_oebps_content(D,I,P)(D doc_abstraction, I doc_matters, P parts) {
+    string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO sort uuid in doc_matters!
+    string content = format(q"¶  <?xml version='1.0' encoding='utf-8'?>
+  <package xmlns="http://www.idpf.org/2007/opf" version="2.0" unique-identifier="EPB-UUID">
+    <metadata
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xmlns:dcterms="http://purl.org/dc/terms/"
+      xmlns:dc="http://purl.org/dc/elements/1.1/"
+      unique-identifier="urn:uuid:%s" version="2.0">
+      <!-- <dc:title id="title">%s</dc:title> -->
+      <dc:title id="title">%s</dc:title>
+      <meta refines="#title" property="title-type">main</meta>
+      <dc:title id="subtitle">%s</dc:title>
+      <meta refines="#subtitle" property="title-type">subtitle</meta>
+      <dc:creator file-as="%s" id="aut">%s</dc:creator>
+      <dc:language>%s</dc:language>
+      <dc:date id="published">%s</dc:date>
+      <dc:rights>Copyright: %s</dc:rights>
+      <dc:identifier scheme="URI">%s</dc:identifier>
+      <dc:identifier id="bookid">urn:uuid:%s</dc:identifier>
+      <!-- <dc:identifier id="EPB-UUID">urn:uuid:%s</dc:identifier> -->
+    </metadata>
+    <manifest>
+      <!-- NCX epub2 navigation -->
+        <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
+      <!-- CSS Style Sheets -->
+        <item id="main-css" href="css/xhtml.css" media-type="text/css" />
+      <!-- nav epub3 navigation -->
+        <item id="nav" href="toc_nav.xhtml" media-type="application/xhtml+xml" properties="nav" />
+  ¶",
+      uuid,
+      doc_matters.dochead_meta["title"]["full"],
+      doc_matters.dochead_meta["title"]["main"],
+      (doc_matters.dochead_meta["title"]["sub"].empty)
+        ? "" : doc_matters.dochead_meta["title"]["sub"],
+      (doc_matters.dochead_meta["creator"]["author"].empty)
+        ? "" : doc_matters.dochead_meta["creator"]["author"],
+      (doc_matters.dochead_meta["creator"]["author"].empty)
+        ? "" : doc_matters.dochead_meta["creator"]["author"],
+      doc_matters.language,
+      (doc_matters.dochead_meta["date"]["published"].empty)
+        ? "" : doc_matters.dochead_meta["date"]["published"],
+      (doc_matters.dochead_meta["rights"]["copyright"].empty)
+        ? "" : doc_matters.dochead_meta["rights"]["copyright"],
+      uuid,
+      uuid,
+      uuid,
+    );
+    content ~= "    " ~ "<!-- Content Documents -->" ~ "\n  ";
+    content ~= parts["manifest_documents"];
+    // TODO sort jpg & png
+    content ~= "    " ~ "<!-- Images -->" ~ "\n  ";
+    foreach (image; doc_matters.image_list) {
+      content ~= format(q"¶      <item id="%s" href="image/%s" media-type="image/png" />
+  ¶",
+        image,                        // strip image type, remove .png .jpg suffix, use in media-type="image/"
+        image,
+      );
+    }
+    content ~= "  " ~ "</manifest>"         ~ "\n  ";
+    content ~= "  " ~ "<spine toc=\"ncx\">" ~ "\n  ";
+    content ~= parts["spine"];
+    content ~= "  " ~ "</spine>"            ~ "\n  ";
+    content ~= "  " ~ "<guide>"             ~ "\n  ";
+    content ~= parts["guide"];
+    content ~= "  " ~ "</guide>"            ~ "\n  ";
+    content ~= ""   ~ "</package>";
+    return content;
+  }
+  string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
+    enum DomTags { none, open, close, close_and_open, open_still, }
+    auto markup = InlineMarkup();
+    string toc ="<nav epub:type=\"toc\" id=\"toc\">\n";
+    foreach (sect; doc_matters.keys_seq_seg) {
+      foreach (obj; doc_abstraction[sect]) {
+        if (obj.is_a == "heading") {
+          foreach_reverse (n; 0 .. 7) {
+            string k = n.to!string;
+            switch (obj.dom_collapsed[n]) {
+            case DomTags.close :
+              toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "</li>" ~ "\n";
+              toc ~= markup.indent_by_spaces_provided(n, "  ") ~ "</ol>" ~ "\n";
+              break;
+            case DomTags.close_and_open :
+              toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "</li>" ~ "\n";
+              if  (obj.dom_markedup[n] < 4) {
+                toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+                ~ markup.indent_by_spaces_provided((n + 2), "  ")
+                ~ "<span class=\"navhd\">" ~ obj.text ~ "</span>" ~ "\n";
+              } else {
+                string hashtag =(obj.heading_lev_markup == 4)
+                ? ""
+                : ("#" ~ obj.ocn.to!string);
+                toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+                ~ markup.indent_by_spaces_provided((n + 2), "  ")
+                ~ "<a href=\"" ~ obj.segment_anchor_tag ~ ".xhtml" ~ hashtag ~ "\">"
+                ~ obj.text
+                ~ "</a>" ~ "\n";
+              }
+              break;
+            case DomTags.open :
+              toc ~= markup.indent_by_spaces_provided(n, "  ") ~ "<ol>" ~ "\n";
+              if  (obj.dom_markedup[n] < 4) {
+                toc ~= markup.indent_by_spaces_provided(n, "  ")
+                ~ "<li><span class=\"navhd\">" ~ obj.text ~ "</span>" ~ "\n";
+              } else {
+                string hashtag =(obj.heading_lev_markup == 4)
+                ? ""
+                : ("#" ~ obj.ocn.to!string);
+                toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
+                ~ markup.indent_by_spaces_provided((n + 2), "  ")
+                ~ "<a href=\"" ~ obj.segment_anchor_tag ~ ".xhtml" ~ hashtag ~ "\">"
+                ~ obj.text
+                ~ "</a>" ~ "\n";
+              }
+              break;
+            default :
+              break;
+            }
+          }
+        }
+      }
+    }
+    toc ~="</nav>\n";
+    return toc;
+  }
+  string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
+    int counter = 0;
+    string uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
+    auto markup = InlineMarkup();
+    enum DomTags { none, open, close, close_and_open, open_still, }
+    string toc = format(q"¶<?xml version='1.0' encoding='utf-8'?>
+  <ncx xmlns="http://www.daisy.org/z3986/2005/ncx/" version="2005-1">
+    <head>
+      <!-- four required metadata items (for all NCX documents,
+        (including the relaxed constraints of OPS 2.0) -->
+      <title>%s%s</title>
+      <link href="css/xhtml.css" rel="stylesheet" type="text/css" id="main-css" />
+      <meta name="dtb:uid" content="urn:uuid:%s" />
+      <!-- <meta name="epub-creator" content="SiSU http://www.jus.uio.no/sisu (this copy)" /> -->
+      <meta name="dtb:depth" content="%s" />
+      <meta name="dtb:totalPageCount" content="0" />
+      <meta name="dtb:maxPageNumber" content="0" />
+    </head>
+    <docTitle>
+      <text>%s</text>
+    </docTitle>
+    <docAuthor>
+      <text>%s</text>
+    </docAuthor>
+    <navMap>¶",
+      doc_matters.dochead_meta["title"]["full"],                                                               // title
+      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : " by " ~ doc_matters.dochead_meta["creator"]["author"], // author
+      uuid,                                                                                        // uuid
+      "3",                                                                                         // content depth
+      doc_matters.dochead_meta["title"]["full"],                                                               // title
+      (doc_matters.dochead_meta["creator"]["author"].empty) ? "" : doc_matters.dochead_meta["creator"]["author"],          // author
+    );
+    foreach (sect; doc_matters.keys_seq_seg) {
+      foreach (obj; doc_abstraction[sect]) {
+        if (obj.is_a == "heading") {
+          foreach_reverse (k; 0 .. 7) {
+            switch (obj.dom_markedup[k]) {
+            case DomTags.close :
+  toc ~= "</navPoint>";
+              break;
+            case DomTags.close_and_open :
+              ++counter;
+  toc ~= "</navPoint>";
+  toc ~= format(q"¶<navPoint class="chapter" id="navpoint" playOrder="%s">
+  <navLabel>
+    <text>%s</text>
+  </navLabel>
+  <content src="%s" />¶",
+  counter,
+  obj.text,
+  obj.segment_anchor_tag,   // lev < 4 [no link]; lev == 4 [filename] markup.xhtml; lev > 4 [filename#ocn] (links done in segment_anchor_tag)
+  );
+              break;
+            case DomTags.open :
+              ++counter;
+  toc ~= format(q"¶<navPoint class="chapter" id="navpoint" playOrder="%s">
+  <navLabel>
+    <text>%s</text>
+  </navLabel>
+  <content src="%s" />¶",
+  counter,
+  obj.text,
+  obj.segment_anchor_tag,   // lev < 4 [no link]; lev == 4 [filename] markup.xhtml; lev > 4 [filename#ocn] (fix links in segment_anchor_tag)
+  );
+              break;
+            default :
+              break;
+            }
+          }
+        }
+      }
+    }
+    toc ~= format(q"¶  </navMap>
+  </ncx>¶");
+    return toc;
+  }
+  
+  void outputEPub3(D,I)(
+    auto return ref const D    doc_abstraction,
+    auto return ref I          doc_matters,
+  ) {
+    mixin SiSUoutputRgxInit;
+    auto xhtml_format = outputXHTMLs();
+    auto rgx = Rgx();
+    string[][string] doc_epub3;
+    string[][string] doc_epub3_endnotes;
+    string[] doc;
+    string segment_filename;
+    string[] top_level_headings = ["","","",""];
+    string[string] oepbs_content_parts;
+    string suffix = ".xhtml";
+    foreach (part; doc_matters.keys_seq_seg) {
+      foreach (obj; doc_abstraction[part]) {
+        if (obj.is_a == "heading") {
+          switch (obj.heading_lev_markup) {
+          case 0: .. case 3:
+            /+ fill buffer, and replace with new levels from 1 to 3 +/
+            switch (obj.heading_lev_markup) {
+            case 0:
+              top_level_headings[0] = "";
+              top_level_headings[1] = "";
+              top_level_headings[2] = "";
+              top_level_headings[3] = "";
+              goto default;
+            case 1:
+              top_level_headings[1] = "";
+              top_level_headings[2] = "";
+              top_level_headings[3] = "";
+              goto default;
+            case 2:
+              top_level_headings[2] = "";
+              top_level_headings[3] = "";
+              goto default;
+            case 3:
+              top_level_headings[3] = "";
+              goto default;
+            default:
+              auto t = xhtml_format.heading_seg(obj, suffix);
+              top_level_headings[obj.heading_lev_markup] = t[0];
+              break;
+            }
+            break;
+          case 4:
+            segment_filename = obj.segment_anchor_tag;
+            doc_epub3[segment_filename] ~= xhtml_format.seg_head(doc_matters.dochead_meta);
+            foreach (top_level_heading; top_level_headings) {
+              doc_epub3[segment_filename] ~= top_level_heading;
+            }
+            auto t = xhtml_format.heading_seg(obj, suffix);
+            doc_epub3[segment_filename] ~= t[0];
+            doc_epub3_endnotes[segment_filename] ~= t[1];
+            break;
+          case 5: .. case 7:
+            auto t = xhtml_format.heading_seg(obj, suffix);
+            doc_epub3[segment_filename] ~= t[0];
+            doc_epub3_endnotes[segment_filename] ~= t[1];
+            break;
+          case 8: .. case 9: // unused numbers, if remain check
+            if ((doc_matters.opt_action_bool["debug"])) {
+              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
+              writeln(__FILE__, ":", __LINE__, ": ", obj.text); // check
+            }
+            break;
+          default:
+            if ((doc_matters.opt_action_bool["debug"])) {
+              writeln(__FILE__, ":", __LINE__, ": ", obj.is_a, ": ", obj.heading_lev_markup);
+            }
+            break;
+          }
+        } else {
+          switch (obj.use) {
+          case "frontmatter":
+            switch (obj.is_of) {
+            case "para":
+              switch (obj.is_a) {
+              case "toc":
+                doc_epub3[segment_filename] ~= xhtml_format.toc(obj);
+                break;
+              default:
+                if ((doc_matters.opt_action_bool["debug"])) {
+                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
+                }
+                break;
+              }
+              break;
+            default:
+              if ((doc_matters.opt_action_bool["debug"])) {
+                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
+              }
+              break;
+            }
+            break;
+          case "body":
+            switch (obj.is_of) {
+            case "para":
+              switch (obj.is_a) {
+              case "para":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              default:
+                if ((doc_matters.opt_action_bool["debug"])) {
+                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
+                }
+                break;
+              }
+              break;
+            case "block":
+              switch (obj.is_a) {
+              case "quote":
+                auto t = xhtml_format.quote_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= to!string(t[0]);
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "group":
+                auto t = xhtml_format.group_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= to!string(t[0]);
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "block":
+                auto t = xhtml_format.block_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= to!string(t[0]);
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "poem":
+                break;
+              case "verse":
+                auto t = xhtml_format.verse_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= to!string(t[0]);
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "code":
+                doc_epub3[segment_filename] ~= xhtml_format.code(obj);
+                break;
+              case "table":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              default:
+                if ((doc_matters.opt_action_bool["debug"])) {
+                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
+                }
+                break;
+              }
+              break;
+            default:
+              if ((doc_matters.opt_action_bool["debug"])) {
+                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
+              }
+              break;
+            }
+            break;
+          case "backmatter":
+            switch (obj.is_of) {
+            case "para":
+              switch (obj.is_a) {
+              case "endnote":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                break;
+              case "glossary":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "bibliography":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "bookindex":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              case "blurb":
+                auto t = xhtml_format.para_seg(obj, suffix);
+                doc_epub3[segment_filename] ~= t[0];
+                doc_epub3_endnotes[segment_filename] ~= t[1];
+                break;
+              default:
+                if ((doc_matters.opt_action_bool["debug"])) {
+                  writeln(__FILE__, ":", __LINE__, ": ", obj.is_a);
+                }
+                break;
+              }
+              break;
+            default:
+              if ((doc_matters.opt_action_bool["debug"])) {
+                writeln(__FILE__, ":", __LINE__, ": ", obj.is_of);
+              }
+              break;
+            }
+            break;
+          case "comment":
+            break;
+          default:
+            if ((doc_matters.opt_action_bool["debug"])) {
+              writeln(__FILE__, ":", __LINE__, ": ", obj.use);
+            }
+            break;
+          }
+        }
+        if (obj.is_a == "heading") {
+          if (obj.heading_lev_markup == 4) {
+            oepbs_content_parts["manifest_documents"] ~= format(q"¶      <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
+  ¶",
+              obj.segment_anchor_tag,
+              obj.segment_anchor_tag,
+            );
+            oepbs_content_parts["spine"] ~= format(q"¶    <itemref idref="%s.xhtml" linear="yes" />
+  ¶",
+              obj.segment_anchor_tag,
+            );
+            oepbs_content_parts["guide"] ~= format(q"¶      <reference type="%s" href="%s" />
+  ¶",
+              obj.segment_anchor_tag,
+              obj.segment_anchor_tag,
+            );
+          } else if (obj.heading_lev_markup > 4) {
+            oepbs_content_parts["manifest_documents"] ~= format(q"¶      <item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
+  ¶",
+              obj.segment_anchor_tag,
+              obj.obj_cite_number,
+              obj.segment_anchor_tag,
+              obj.obj_cite_number,
+            );
+            oepbs_content_parts["spine"] ~= format(q"¶    <itemref idref="%s.xhtml#%s" linear="yes" />
+  ¶",
+              obj.segment_anchor_tag,
+              obj.obj_cite_number,
+            );
+            oepbs_content_parts["guide"] ~= format(q"¶      <reference type="%s#%s" href="%s#%s" />
+  ¶",
+              obj.segment_anchor_tag,
+              obj.obj_cite_number,
+              obj.segment_anchor_tag,
+              obj.obj_cite_number,
+            );
+          }
+        }
+      }
+    }
+    /+ epub specific documents +/
+    auto mimetypes = epub3_mimetypes;
+    auto meta_inf_container_xml = epub3_container_xml;
+    auto oebps_toc_ncx = epub2_oebps_toc_ncx(doc_abstraction, doc_matters);
+    auto oebps_toc_nav_xhtml = epub3_oebps_toc_nav_xhtml(doc_abstraction, doc_matters);
+    auto oebps_content_opf = epub3_oebps_content(doc_abstraction, doc_matters, oepbs_content_parts);
+    epub3_write_output_files(
+      doc_matters,
+      doc_epub3,
+      doc_epub3_endnotes,
+      mimetypes,
+      meta_inf_container_xml,
+      oebps_toc_nav_xhtml,
+      oebps_toc_ncx,
+      oebps_content_opf,
+    );
+  }
+  void epub3_write_output_files(M,D,E,Mt,Mic,Otnx,Otn,Oc)(
+    M    doc_matters,
+    D    doc_epub3,
+    E    doc_epub3_endnotes,
+    Mt   mimetypes,
+    Mic  meta_inf_container_xml,
+    Otnx oebps_toc_nav_xhtml,
+    Otn  oebps_toc_ncx,
+    Oc   oebps_content_opf,
+  ) {
+    debug(asserts) {
+      static assert(is(typeof(doc_epub3)              == string[][string]));
+      static assert(is(typeof(mimetypes)              == string));
+      static assert(is(typeof(meta_inf_container_xml) == string));
+      static assert(is(typeof(oebps_toc_nav_xhtml)    == string));
+      static assert(is(typeof(oebps_toc_ncx)          == string));
+      static assert(is(typeof(oebps_content_opf)      == string));
+    }
+    mixin SiSUpaths;
+    auto pth_epub3 = Epub3paths();
+    auto xhtml_format = outputXHTMLs();
+    /+ zip file +/
+    auto fn_epub = pth_epub3.epub_file(doc_matters.source_filename);
+    auto zip = new ZipArchive(); // ZipArchive zip = new ZipArchive();
+    /+ zip archive member files +/
+    try {
+      if (!exists(pth_epub3.doc_meta_inf(doc_matters.source_filename))) {
+        pth_epub3.doc_meta_inf(doc_matters.source_filename).mkdirRecurse;
+      }
+      if (!exists(pth_epub3.doc_oebps_css(doc_matters.source_filename))) {
+        pth_epub3.doc_oebps_css(doc_matters.source_filename).mkdirRecurse;
+      }
+      if (!exists(pth_epub3.doc_oebps_image(doc_matters.source_filename))) {
+        pth_epub3.doc_oebps_image(doc_matters.source_filename).mkdirRecurse;
+      }
+      { /+ OEBPS/[segments].xhtml (the document contents) +/
+        foreach (seg_filename; doc_matters.segnames) {
+          string fn = pth_epub3.fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename);
+          /+ add zip archive file members (with their content) +/
+          auto zip_arc_member_file = new ArchiveMember();
+          // add seg fn to zip archive
+          zip_arc_member_file.name = fn;
+          auto zip_data = new OutBuffer();
+          debug(epub_output) {
+            string fn_dbg = pth_epub3.dbg_fn_oebps_content_xhtml(doc_matters.source_filename, seg_filename);
+            auto f = File(fn_dbg, "w");
+          }
+          /+ // f.writeln(seg_head); // not needed built and inserted earlier +/
+          foreach (docseg; doc_epub3[seg_filename]) {
+            debug(epub_output) { f.writeln(docseg); }
+            zip_data.write(docseg.dup); // cast as: char[]
+          }
+          foreach (docseg; doc_epub3_endnotes[seg_filename]) {
+            debug(epub_output) { f.writeln(docseg); }
+            zip_data.write(docseg.dup); // cast as: char[]
+          }
+          debug(epub_output) { f.writeln(xhtml_format.tail); } // needed for each lev4
+          zip_data.write(xhtml_format.tail.dup); // cast as: char[]
+          zip_arc_member_file.expandedData = zip_data.toBytes();
+          zip.addMember(zip_arc_member_file);
+          /+ create the zip file +/
+          createZipFile!()(fn_epub, zip.build());
+        }
+      }
+      string fn;
+      debug(epub_output) { string fn_dbg; }
+      File f;
+      { /+ mimetypes (identify zip file type) +/
+        debug(epub_output) {
+          fn_dbg = pth_epub3.dbg_fn_mimetypes(doc_matters.source_filename);
+          File(fn_dbg, "w").writeln(mimetypes);
+        }
+        fn = pth_epub3.fn_mimetypes(doc_matters.source_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add mimetypes to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        zip_data.write(mimetypes.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
+      }
+      { /+  META-INF/container.xml (identify doc root) +/
+        debug(epub_output) {
+          fn_dbg = pth_epub3.dbg_fn_dmi_container_xml(doc_matters.source_filename);
+          File(fn_dbg, "w").writeln(meta_inf_container_xml);
+        }
+        fn = pth_epub3.fn_dmi_container_xml(doc_matters.source_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add META-INF/container.xml to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        zip_data.write(meta_inf_container_xml.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
+      }
+      { /+ OEBPS/toc_nav.xhtml (navigation toc epub3) +/
+        debug(epub_output) {
+          fn_dbg = pth_epub3.dbg_fn_oebps_toc_nav_xhtml(doc_matters.source_filename);
+          File(fn_dbg, "w").writeln(oebps_toc_nav_xhtml);
+        }
+        fn = pth_epub3.fn_oebps_toc_nav_xhtml(doc_matters.source_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add OEBPS/toc_nav.xhtml to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        zip_data.write(oebps_toc_nav_xhtml.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
+      }
+      { /+ TODO OEBPS/toc.ncx (navigation toc epub2) +/
+        debug(epub_output) {
+          fn_dbg = pth_epub3.dbg_fn_oebps_toc_ncx(doc_matters.source_filename);
+          File(fn_dbg, "w").writeln(oebps_toc_ncx);
+        }
+        fn = pth_epub3.fn_oebps_toc_ncx(doc_matters.source_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add OEBPS/toc.ncx to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        zip_data.write(oebps_toc_ncx.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
+      }
+      { /+ TODO OEBPS/content.opf (doc manifest) +/
+        debug(epub_output) {
+          fn_dbg = pth_epub3.dbg_fn_oebps_content_opf(doc_matters.source_filename);
+          File(fn_dbg, "w").writeln(oebps_content_opf);
+        }
+        fn = pth_epub3.fn_oebps_content_opf(doc_matters.source_filename);
+        /+ add zip archive file members (with their content) +/
+        auto zip_arc_member_file = new ArchiveMember();
+        // add OEBPS/content.opf to zip archive
+        zip_arc_member_file.name = fn;
+        auto zip_data = new OutBuffer();
+        zip_data.write(oebps_content_opf.dup); // cast as: char[]
+        zip_arc_member_file.expandedData = zip_data.toBytes();
+        zip.addMember(zip_arc_member_file);
+        /+ create the zip file +/
+        createZipFile!()(fn_epub, zip.build());
+      }
+      { /+ OEBPS/_sisu/image (images) +/
+        foreach (image; doc_matters.image_list) {
+          if (exists("_sisu/image/"~ image)) {
+            ("_sisu/image/"~ image)
+            .copy((pth_epub3.doc_oebps_image(doc_matters.source_filename)) ~ "/" ~ image);
+          }
+        }
+        foreach (image; doc_matters.image_list) {
+          debug(epub_images) {
+            writeln(
+              "_sisu/image/", image, " -> ",
+              pth_epub3.doc_oebps_image(doc_matters.source_filename), "/", image
+            );
+          }
+          auto fn_src = "_sisu/image/"~ image;
+          auto fn_out =  pth_epub3.doc_oebps_image(doc_matters.source_filename).to!string ~ "/" ~ image;
+          if (exists(fn_src)) {
+            {
+              auto zip_arc_member_file = new ArchiveMember();
+              zip_arc_member_file.name = fn_out;
+              auto zip_data = new OutBuffer();
+              zip_data.write(cast(char[]) ((fn_src).read));
+              zip_arc_member_file.expandedData = zip_data.toBytes();
+              zip.addMember(zip_arc_member_file);
+              createZipFile!()(fn_epub, zip.build());
+            }
+          }
+        }
+      }
+    }
+    catch (ErrnoException ex) {
+      // Handle error
+    }
+    debug(epub_archive) {
+      if (exists(fn_epub)) {
+        try {
+          auto zipped = new ZipArchive((fn_epub).read);
+          foreach (filename, member; zipped.directory) {
+            auto data = zipped.expand(member);
+            writeln(filename, " length ", data.length); // member.name
+            // Use data
+          }
+        }
+        catch (ZipException ex) {
+          // Handle errors
+        }
+      }
+    }
+  }
+  
+}
diff --git a/src/sdp/output_html.d b/src/sdp/output_html.d
index ba6adc8..71faa67 100644
--- a/src/sdp/output_html.d
+++ b/src/sdp/output_html.d
@@ -3,22 +3,26 @@ template outputHTML() {
     std.algorithm,
     std.array,
     std.container,
+    std.digest.sha,
     std.exception,
     std.file,
     std.getopt,
     std.json,
-    std.process,
-    std.stdio,
+    std.outbuffer,
     std.path,
+    std.process,
     std.range,
     std.regex,
+    std.stdio,
     std.string,
     std.traits,
     std.typecons,
     std.uni,
     std.utf,
+    std.zip,
     std.conv : to;
   import
+    create_zip_file,
     defaults,
     output_rgx,
     output_xhtmls;
@@ -169,7 +173,7 @@ template outputHTML() {
     Fn fn_src,
     C doc,
   ) {
-    debug(asserts){
+    debug(asserts) {
       static assert(is(typeof(fn_src) == string));
       static assert(is(typeof(doc)    == string[]));
     }
@@ -404,7 +408,7 @@ template outputHTML() {
     D doc_html,
     E doc_html_endnotes,
   ) {
-    debug(asserts){
+    debug(asserts) {
       static assert(is(typeof(doc_html)      == string[][string]));
     }
     mixin SiSUoutputRgxInit;
diff --git a/src/sdp/output_hub.d b/src/sdp/output_hub.d
index 67275e0..65c8990 100644
--- a/src/sdp/output_hub.d
+++ b/src/sdp/output_hub.d
@@ -1,5 +1,5 @@
 /++
-  output hub<BR>
+  output hub<br>
   check & generate output types requested
 +/
 template outputHub() {
@@ -20,13 +20,14 @@ template outputHub() {
     std.traits,
     std.typecons,
     std.uni,
-    std.utf,
+    std.utf;
+  import
     defaults,
-    output_epub,
+    output_epub3,
     output_html,
     output_xhtmls,
-    source_sisupod;
-  import
+    source_sisupod,
+    create_zip_file,
     output_rgx,
     output_xhtmls;
   void outputHub(D,I)(D doc_abstraction, I doc_matters) {
@@ -65,10 +66,10 @@ template outputHub() {
       if ((doc_matters.opt_action_bool["verbose"])) {writeln("html scroll done");}
     }
     if (doc_matters.opt_action_bool["epub"]) {
-      if ((doc_matters.opt_action_bool["verbose"])) {write("epub processing... ");}
-      outputEPub!()(doc_abstraction, doc_matters);
+      if ((doc_matters.opt_action_bool["verbose"])) {write("epub3 processing... ");}
+      outputEPub3!()(doc_abstraction, doc_matters);
       // epub.css_write;
-      if ((doc_matters.opt_action_bool["verbose"])) {writeln("epub done");}
+      if ((doc_matters.opt_action_bool["verbose"])) {writeln("epub3 done");}
     }
     if (doc_matters.opt_action_bool["pdf"]) {
       /+ mixin outputPDF; +/
diff --git a/src/sdp/output_xhtmls.d b/src/sdp/output_xhtmls.d
index 2a86d4c..804b82f 100644
--- a/src/sdp/output_xhtmls.d
+++ b/src/sdp/output_xhtmls.d
@@ -3,22 +3,26 @@ template outputXHTMLs() {
     std.algorithm,
     std.array,
     std.container,
+    std.digest.sha,
     std.exception,
     std.file,
     std.getopt,
     std.json,
-    std.process,
-    std.stdio,
+    std.outbuffer,
     std.path,
+    std.process,
     std.range,
     std.regex,
+    std.stdio,
     std.string,
     std.traits,
     std.typecons,
     std.uni,
     std.utf,
+    std.zip,
     std.conv : to;
   import
+    create_zip_file,
     defaults,
     output_rgx,
     output_xhtmls;
@@ -30,7 +34,7 @@ template outputXHTMLs() {
         .replaceAll(rgx.xhtml_ampersand,    "&amp;")
         .replaceAll(rgx.xhtml_less_than,    "&lt;")
         .replaceAll(rgx.xhtml_greater_than, "&gt;")
-        .replaceAll(rgx.xhtml_line_break,   "<br>");
+        .replaceAll(rgx.xhtml_line_break,   "<br />");
       return _txt;
     }
     string font_face(string _txt){
@@ -61,7 +65,7 @@ template outputXHTMLs() {
     auto scroll_head(Me)(
       Me dochead_meta,
     ) {
-      debug(asserts){
+      debug(asserts) {
         static assert(is(typeof(dochead_meta) == string[string][string]));
       }
       string o;
@@ -69,26 +73,27 @@ template outputXHTMLs() {
     <html>
     <head>
       <meta charset="utf-8">
-      <title>
-        %s%s
-      </title>
-    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
-      <meta name="dc.title" content="Title" />
-      <meta name="dc.author" content="Author" />
-      <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
-      <meta name="dc.date" content="year" />
-      <meta name="dc.date.created" content="year" />
-      <meta name="dc.date.issued" content="year" />
-      <meta name="dc.date.available" content="year" />
-      <meta name="dc.date.valid" content="year" />
-      <meta name="dc.date.modified" content="year" />
-      <meta name="dc.language" content="US" />
-      <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
-      <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
-        <link rel="generator" href="http://www.sisudoc.org/" />
+        <title>
+          %s%s
+        </title>
+        <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+        <meta name="dc.title" content="Title" />
+        <meta name="dc.author" content="Author" />
+        <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
+        <meta name="dc.date" content="year" />
+        <meta name="dc.date.created" content="year" />
+        <meta name="dc.date.issued" content="year" />
+        <meta name="dc.date.available" content="year" />
+        <meta name="dc.date.valid" content="year" />
+        <meta name="dc.date.modified" content="year" />
+        <meta name="dc.language" content="US" />
+        <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
+        <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
+      </meta>
+      <link rel="generator" href="http://www.sisudoc.org/" />
       <link rel="shortcut icon" href="../_sisu/image/rb7.ico" />
-      <link href="../../_sisu/css/html.css" rel="stylesheet">
-      <link href="../../../_sisu/css/html.css" rel="stylesheet">
+      <link href="../../_sisu/css/html.css" rel="stylesheet" />
+      <link href="../../../_sisu/css/html.css" rel="stylesheet" />
     </head>
     <body lang="en">
     <a name="top" id="top"></a>¶",
@@ -100,7 +105,7 @@ template outputXHTMLs() {
     auto seg_head(Me)(
       Me dochead_meta,
     ) {
-      debug(asserts){
+      debug(asserts) {
         static assert(is(typeof(dochead_meta) == string[string][string]));
       }
       string o;
@@ -108,26 +113,27 @@ template outputXHTMLs() {
     <html>
     <head>
       <meta charset="utf-8">
-      <title>
-        %s%s
-      </title>
-    <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
-      <meta name="dc.title" content="Title" />
-      <meta name="dc.author" content="Author" />
-      <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
-      <meta name="dc.date" content="year" />
-      <meta name="dc.date.created" content="year" />
-      <meta name="dc.date.issued" content="year" />
-      <meta name="dc.date.available" content="year" />
-      <meta name="dc.date.valid" content="year" />
-      <meta name="dc.date.modified" content="year" />
-      <meta name="dc.language" content="US" />
-      <meta name="dc.rights" content="Copyright: Copyright (C) year holder />
-      <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
-        <link rel="generator" href="http://www.sisudoc.org/" />
+        <title>
+          %s%s
+        </title>
+        <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+        <meta name="dc.title" content="Title" />
+        <meta name="dc.author" content="Author" />
+        <meta name="dc.publisher" content="SiSU http://www.jus.uio.no/sisu (this copy)" />
+        <meta name="dc.date" content="year" />
+        <meta name="dc.date.created" content="year" />
+        <meta name="dc.date.issued" content="year" />
+        <meta name="dc.date.available" content="year" />
+        <meta name="dc.date.valid" content="year" />
+        <meta name="dc.date.modified" content="year" />
+        <meta name="dc.language" content="US" />
+        <meta name="dc.rights" content="Copyright: Copyright (C) year holder" />
+        <meta name="generator" content="sdp [SiSU 7.1.8 of 2016w08/5 (2016-02-26)] (n*x and D)" />
+      </meta>
+      <link rel="generator" href="http://www.sisudoc.org/" />
       <link rel="shortcut icon" href="../_sisu/image/rb7.ico" />
-      <link href="../../_sisu/css/html.css" rel="stylesheet">
-      <link href="../../../_sisu/css/html.css" rel="stylesheet">
+      <link href="../../_sisu/css/html.css" rel="stylesheet" />
+      <link href="../../../_sisu/css/html.css" rel="stylesheet" />
     </head>
     <body lang="en">
     <a name="top" id="top"></a>¶",
@@ -192,13 +198,13 @@ template outputXHTMLs() {
       return _txt;
     }
     auto inline_notes_scroll(O)(
-      auto return ref const O         obj,
-      string                  _txt,
+      auto return ref const O   obj,
+      string                    _txt,
     ) {
       if (obj.inline_notes_reg) {
         _txt = (_txt).replaceAll(
           rgx.inline_notes_delimiter_al_regular_number_note,
-          ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&nbsp;<sup>$1</sup>&nbsp;</note></a>")
+          ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&#160;<sup>$1</sup>&#160;</note></a>")
         );
       }
       debug(markup_endnotes) {
@@ -236,7 +242,7 @@ template outputXHTMLs() {
             "\">",
             "<note id=\"note_",
             m.captures[1],
-            "\">&nbsp;<sup>",
+            "\">&#160;<sup>",
             m.captures[1],
             ".</sup></note></a>",
             m.captures[2],
@@ -245,7 +251,7 @@ template outputXHTMLs() {
         }
         _txt = (_txt).replaceAll(
           rgx.inline_notes_delimiter_al_regular_number_note,
-          ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&nbsp;<sup>$1</sup>&nbsp;</note></a>")
+          ("<a href=\"#note_$1\"><note id=\"noteref_$1\">&#160;<sup>$1</sup>&#160;</note></a>")
         );
       } else if (_txt.match(rgx.inline_notes_delimiter_al_regular_number_note)) {
         debug(markup) {
@@ -301,7 +307,7 @@ template outputXHTMLs() {
       auto tags = _xhtml_anchor_tags(obj.anchor_tags);
       string o;
       if (obj.obj_cite_number.empty) {
-        o = format(q"¶<br><hr /><br>
+        o = format(q"¶<br /><hr /><br />
       <div class="substance">
         <h%s class="%s">%s
           %s
@@ -314,7 +320,7 @@ template outputXHTMLs() {
           obj.heading_lev_markup,
         );
       } else {
-        o = format(q"¶<br><hr /><br>
+        o = format(q"¶<br /><hr /><br />
       <div class="substance">
         <label class="ocn"><a href="#%s" class="lnkocn">%s</a></label>
         <h%s class="%s" id="%s"><a name="%s"></a>%s
@@ -364,7 +370,7 @@ template outputXHTMLs() {
       auto tags = _xhtml_anchor_tags(obj.anchor_tags);
       _txt = font_face(_txt);
       string o;
-      _txt = (obj.bullet) ? ("●&nbsp;&nbsp" ~ _txt) : _txt;
+      _txt = (obj.bullet) ? ("●&#160;&#160;" ~ _txt) : _txt;
       if (obj.obj_cite_number.empty) {
         o = format(q"¶  <div class="substance">
       <p class="%s" indent="h%si%s">%s
@@ -541,7 +547,6 @@ template outputXHTMLs() {
     </div>¶",
           obj.is_a,
           _txt
-          // obj.text
         );
       } else {
         o = format(q"¶  <div class="substance">
@@ -555,7 +560,6 @@ template outputXHTMLs() {
           obj.is_a,
           obj.obj_cite_number,
           _txt
-          // obj.text
         );
       }
       return o;
@@ -589,9 +593,9 @@ template outputXHTMLs() {
     ) {
       _txt = font_face(_txt);
       _txt = (_txt)
-        .replaceAll(rgx.newline, "<br>\n")
-        .replaceAll(rgx.two_spaces, "&nbsp;" ~ "&nbsp;" ~ "&nbsp;" ~ "&nbsp;")
-        .replaceAll(rgx.nbsp_and_space, "&nbsp;" ~ "&nbsp;")
+        .replaceAll(rgx.newline, "<br />\n")
+        .replaceAll(rgx.two_spaces, "&#160;" ~ "&#160;" ~ "&#160;" ~ "&#160;")
+        .replaceAll(rgx.nbsp_and_space, "&#160;" ~ "&#160;")
         .replaceAll(rgx.strip_br, "");
       string o;
       if (obj.obj_cite_number.empty) {
@@ -723,8 +727,8 @@ template outputXHTMLs() {
     ) {
       string _txt = obj.text;
       _txt = (_txt)
-        .replaceAll(rgx.newline, "<br>\n")
-        .replaceAll(rgx.nbsp_char, "&nbsp;");
+        .replaceAll(rgx.newline, "<br />\n")
+        .replaceAll(rgx.nbsp_char, "&#160;");
       string o;
       if (obj.obj_cite_number.empty) {
           o = format(q"¶  <div class="substance">
diff --git a/src/sdp/source_sisupod.d b/src/sdp/source_sisupod.d
index e6702bf..cf15348 100644
--- a/src/sdp/source_sisupod.d
+++ b/src/sdp/source_sisupod.d
@@ -3,103 +3,206 @@ template SiSUpod() {
     std.algorithm,
     std.array,
     std.container,
+    std.digest.sha,
     std.exception,
     std.file,
     std.getopt,
     std.json,
-    std.process,
-    std.stdio,
+    std.outbuffer,
     std.path,
+    std.process,
     std.range,
     std.regex,
+    std.stdio,
     std.string,
     std.traits,
     std.typecons,
     std.uni,
     std.utf,
+    std.zip,
     std.conv : to;
   import
+    create_zip_file,
     defaults,
     output_rgx,
     output_xhtmls;
   void SiSUpod(T)(T doc_matters) {
-    debug(asserts){
+    debug(asserts) {
       // static assert(is(typeof(doc_matters) == tuple));
     }
     mixin SiSUoutputRgxInit;
     mixin SiSUpaths;
-    auto pth_sisupod = SiSUpodPaths();
+    auto pth_sisupod = SiSUpodPathsZipped();
+    auto pth_sisupod_filesystem = SiSUpodPathsFilesystemArchive();
     mixin SiSUlanguageCodes;
     auto lang = Lang();
     auto rgx = Rgx();
     assert (doc_matters.source_filename.match(rgx.src_fn));
     try {
       /+ create directory structure +/
-      if (!exists(pth_sisupod.doc(doc_matters.source_filename))) {
-        pth_sisupod.doc(doc_matters.source_filename).mkdirRecurse;
+      if (!exists(pth_sisupod_filesystem.doc(doc_matters.source_filename))) {
+        pth_sisupod_filesystem.doc(doc_matters.source_filename).mkdirRecurse;
       }
-      if (!exists(pth_sisupod.conf(doc_matters.source_filename))) {
-        pth_sisupod.conf(doc_matters.source_filename).mkdirRecurse;
+      if (!exists(pth_sisupod_filesystem.conf(doc_matters.source_filename))) {
+        pth_sisupod_filesystem.conf(doc_matters.source_filename).mkdirRecurse;
       }
-      if (!exists(pth_sisupod.css(doc_matters.source_filename))) {
-        pth_sisupod.css(doc_matters.source_filename).mkdirRecurse;
+      if (!exists(pth_sisupod_filesystem.css(doc_matters.source_filename))) {
+        pth_sisupod_filesystem.css(doc_matters.source_filename).mkdirRecurse;
       }
-      if (!exists(pth_sisupod.image(doc_matters.source_filename))) {
-        pth_sisupod.image(doc_matters.source_filename).mkdirRecurse;
+      if (!exists(pth_sisupod_filesystem.image(doc_matters.source_filename))) {
+        pth_sisupod_filesystem.image(doc_matters.source_filename).mkdirRecurse;
       }
-      if (!exists(pth_sisupod.doc_lng(doc_matters.source_filename, doc_matters.language))) {
-        pth_sisupod.doc_lng(doc_matters.source_filename, doc_matters.language).mkdirRecurse;
+      if (!exists(pth_sisupod_filesystem.doc_lng(doc_matters.source_filename, doc_matters.language))) {
+        pth_sisupod_filesystem.doc_lng(doc_matters.source_filename, doc_matters.language).mkdirRecurse;
       }
       debug(sisupod) {
         writeln(__LINE__, ": ",
-          // doc_matters.environment["pwd"], "/",
-            doc_matters.source_filename, " -> ",
-          // doc_matters.environment["pwd"], "/",
-            pth_sisupod.fn_doc(
-              doc_matters.source_filename,
-              doc_matters.language
-        ));
-      }
-      if (exists(doc_matters.source_filename)) {
-        copy(
+          doc_matters.source_filename, " -> ",
+          pth_sisupod_filesystem.fn_doc(
           doc_matters.source_filename,
-          pth_sisupod.fn_doc(
-            doc_matters.source_filename,
-            doc_matters.language
+          doc_matters.language
         ));
       }
-      if (doc_matters.file_insert_list.length > 0) {
-        foreach (insert_file; doc_matters.file_insert_list) {
-          debug(sisupod) {
+      auto zip = new ZipArchive();
+      auto fn_sisupod = pth_sisupod.sisupod_filename(doc_matters.source_filename);
+      { /+ bundle images +/
+        foreach (image; doc_matters.image_list) {
+          debug(sisupodimages) {
             writeln(
+              "_sisu/image/", image, " -> ",
+              pth_sisupod.image(doc_matters.source_filename), "/", image
+            );
+          }
+          auto fn_src = "_sisu/image/"~ image;
+          auto fn_out =  pth_sisupod.image(doc_matters.source_filename).to!string ~ "/" ~ image;
+          auto fn_out_filesystem =  pth_sisupod_filesystem.image(doc_matters.source_filename).to!string ~ "/" ~ image;
+          if (exists(fn_src)) {
+            fn_src.copy(fn_out_filesystem);
+            {
+              auto zip_arc_member_file = new ArchiveMember();
+              zip_arc_member_file.name = fn_out;
+              auto zip_data = new OutBuffer();
+              zip_data.write(cast(char[]) ((fn_src).read));
+              zip_arc_member_file.expandedData = zip_data.toBytes();
+              zip.addMember(zip_arc_member_file);
+              createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+            }
+          }
+        }
+      }
+      { /+ bundle sisu_document_make +/
+        auto fn_src = "_sisu/sisu_document_make"; // check (_sisu/sisu_document_make)
+        auto fn_out = pth_sisupod.conf(doc_matters.source_filename).to!string ~ "/" ~ "sisu_document_make";
+        auto fn_out_filesystem = pth_sisupod_filesystem.conf(doc_matters.source_filename).to!string ~ "/" ~ "sisu_document_make";
+        if (exists(fn_src)) {
+          fn_src.copy(fn_out_filesystem);
+          {
+            auto zip_arc_member_file = new ArchiveMember();
+            zip_arc_member_file.name = fn_out;
+            auto zip_data = new OutBuffer();
+            zip_data.write((fn_src).readText);
+            zip_arc_member_file.expandedData = zip_data.toBytes();
+            zip.addMember(zip_arc_member_file);
+            createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+          }
+        }
+      }
+      { /+ bundle primary file +/
+        auto fn_src = doc_matters.source_filename;
+        auto fn_out = pth_sisupod.fn_doc(doc_matters.source_filename, doc_matters.language).to!string;
+        auto fn_out_filesystem = pth_sisupod_filesystem.fn_doc(doc_matters.source_filename, doc_matters.language).to!string;
+        if (exists(fn_src)) {
+          fn_src.copy(fn_out_filesystem);
+          {
+            auto zip_arc_member_file = new ArchiveMember();
+            zip_arc_member_file.name = fn_out;
+            auto zip_data = new OutBuffer();
+            zip_data.write((fn_src).readText);
+            zip_arc_member_file.expandedData = zip_data.toBytes();
+            zip.addMember(zip_arc_member_file);
+            createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+          }
+        }
+      }
+      { /+ bundle insert files +/
+        if (doc_matters.file_insert_list.length > 0) {
+          foreach (insert_file; doc_matters.file_insert_list) {
+            debug(sisupod) {
+              writeln(
                 insert_file, " -> ",
                 pth_sisupod.fn_doc_insert(
                   doc_matters.source_filename,
                   insert_file,
                   doc_matters.language
-            ));
-          }
-          if (exists(insert_file)) {
-            insert_file.copy(
-              pth_sisupod.fn_doc_insert(
-                doc_matters.source_filename,
-                insert_file,
-                doc_matters.language
-            ));
+              ));
+            }
+            auto fn_src = insert_file;
+            auto fn_out = pth_sisupod.fn_doc_insert(
+              doc_matters.source_filename,
+              insert_file,
+              doc_matters.language
+            ).to!string;
+            auto fn_out_filesystem = pth_sisupod_filesystem.fn_doc_insert(
+              doc_matters.source_filename,
+              insert_file,
+              doc_matters.language
+            ).to!string;
+            if (exists(fn_src)) {
+              fn_src.copy(fn_out_filesystem);
+              {
+                auto zip_arc_member_file = new ArchiveMember();
+                zip_arc_member_file.name = insert_file;
+                auto zip_data = new OutBuffer();
+                zip_data.write((fn_src).readText);
+                zip_arc_member_file.expandedData = zip_data.toBytes();
+                zip.addMember(zip_arc_member_file);
+                createZipFile!()(pth_sisupod.sisupod_filename(fn_src), zip.build());
+              }
+            }
           }
         }
       }
-      foreach (image; doc_matters.image_list) {
-        debug(sisupod) {
-          writeln(
-              "_sisu/image/", image, " -> ",
-              pth_sisupod.image(doc_matters.source_filename), "/", image
-          );
+      if (exists(fn_sisupod)) {
+        try {
+          auto data = (cast(byte[]) (fn_sisupod).read);
+          writefln("%-(%02x%) %s", data.sha256Of, fn_sisupod);
+          debug(sisupod) {
+            try {
+              auto zipped = new ZipArchive((fn_sisupod).read);
+              foreach (filename, member; zipped.directory) {
+                auto data = zipped.expand(member);
+                writeln("> ", filename, " length ", data.length); // filename == member.name
+                // Use data
+              }
+            }
+            catch (ZipException ex) {
+              // Handle errors
+            }
+            if (doc_matters.source_filename == "en/the_wealth_of_networks.yochai_benkler.sst") {
+              assert(
+                ((data).sha256Of).toHexString
+                == "DDE0013C13C6A4F06D4BE72087E2CDEF47697CA38A6A2D65BA7207DB6B144271",
+                "\nsisupod: sha256 value for "
+                ~ doc_matters.source_filename
+                ~ " has changed, is now: "
+                ~ ((data).sha256Of).toHexString
+              );
+            }
+            if (doc_matters.source_filename == "en/sisu_markup_stress_test.sst") {
+              assert(
+                ((data).sha256Of).toHexString
+                == "112C0AEDD2518A1803D91A7CF5785274A3116C0779A631782D0C0813B212C68A",
+                "\nsisupod: sha256 value for "
+                ~ doc_matters.source_filename
+                ~ " has changed, is now: "
+                ~ ((data).sha256Of).toHexString
+              );
+            }
+          }
         }
-        if (exists("_sisu/image/"~ image)) {
-          ("_sisu/image/"~ image).copy(
-            (pth_sisupod.image(doc_matters.source_filename) ~ "/" ~ image)
-          );
+          catch (ErrnoException ex)
+        {
+          // Handle errors
         }
       }
       
diff --git a/views/version.txt b/views/version.txt
index 7ae0f62..fe2ce85 100644
--- a/views/version.txt
+++ b/views/version.txt
@@ -4,4 +4,4 @@ struct Version {
   int minor;
   int patch;
 }
-enum ver = Version(0, 13, 8);
+enum ver = Version(0, 13, 9);