0.2.1 segnames, anchor tagsdoc-reform_v0.2.1

5 files changed, 147 insertions, 136 deletions

diff --git a/org/default_misc.org b/org/default_misc.org
index 5d175ee..59e7320 100644
--- a/org/default_misc.org
+++ b/org/default_misc.org
@@ -87,7 +87,8 @@ template DocReformNode() {
         "is"                            : "",
         "ocn"                           : "",
         "marked_up_lev"                 : "",
-        "segment_anchor_tag"            : "",
+        "segment_anchor_tag_html"       : "",
+        "segment_anchor_tag_epub"       : "",
         "attrib"                        : "",
     ];
     return _node;
diff --git a/org/doc_reform.org b/org/doc_reform.org
index e98cdc5..a04f650 100644
--- a/org/doc_reform.org
+++ b/org/doc_reform.org
@@ -24,7 +24,7 @@ struct Version {
   int minor;
   int patch;
 }
-enum ver = Version(0, 2, 0);
+enum ver = Version(0, 2, 1);
 #+END_SRC
 
 ** compilation restrictions (supported compilers)
@@ -931,6 +931,10 @@ auto doc_abstraction = da[docAbst.doc_abstraction]; /+ head ~ toc ~ body ~ endno
 auto _document_section_keys_sequenced = da[docAbst.section_keys];
 string[] _doc_html_segnames = da[docAbst.segnames];
 string[] _doc_epub_segnames_0_4 = da[docAbst.segnames_0_4];
+debug(segnames) {
+  writeln("segnames lv4:      ", _doc_html_segnames);
+  writeln("segnames lv0 to 4: ", _doc_epub_segnames_0_4);
+}
 auto _doc_tag_assoc = da[docAbst.tag_assoc];
 auto _images = da[docAbst.images];
 debug(steps) {
diff --git a/org/meta_abstraction.org b/org/meta_abstraction.org
index 7f200bf..ee94ebc 100644
--- a/org/meta_abstraction.org
+++ b/org/meta_abstraction.org
@@ -186,12 +186,11 @@ string an_object_key;
 string[] anchor_tags;
 string anchor_tag;
 string anchor_tag_;
-string segment_anchor_tag_that_object_belongs_to;
+string[string] segment_anchor_tag_that_object_belongs_to;
 string lev_anchor_tag;
 string[][string] tag_assoc_html;
 string[][string] tag_assoc_lv0_to_lv3_html;
 string[][string] tag_assoc_lv0_to_lv3_epub;
-string segment_anchor_tag_that_object_belongs_to_uri;
 /+ enum +/
 enum State { off, on }
 enum TriState { off, on, closing }
@@ -429,7 +428,7 @@ auto inline_para_link_anchor(O,St,TA)(O an_object, St segment_anchor_tag_that_ob
   static auto rgx = Rgx();
   if (auto m = an_object["substantive"].match(rgx.inline_link_anchor)) {
     if (m.captures[1] !in tag_assoc_html) {
-      tag_assoc_html[(m.captures[1])] = [segment_anchor_tag_that_object_belongs_to];
+      tag_assoc_html[(m.captures[1])] = [segment_anchor_tag_that_object_belongs_to["html"]];
     } else {
       writeln("a tag named  already exists, check text line\n    ", an_object["substantive"]);
     }
@@ -535,8 +534,8 @@ comp_obj_heading_.text                                         = "Table of Conte
 comp_obj_heading_.metainfo.ocn                                 = 0;
 comp_obj_heading_.metainfo.object_number_off                   = "";
 comp_obj_heading_.metainfo.object_number_type                  = 0;
-comp_obj_heading_.tags.segment_anchor_tag                      = "toc";
-comp_obj_heading_.tags.segment_anchor_tag_is                   = comp_obj_heading_.tags.segment_anchor_tag;
+comp_obj_heading_.tags.segment_anchor_tag_html                 = "toc";
+comp_obj_heading_.tags.segment_anchor_tag_epub                 = comp_obj_heading_.tags.segment_anchor_tag_html;
 comp_obj_heading_.metainfo.heading_lev_markup                  = 4;
 comp_obj_heading_.metainfo.heading_lev_collapsed               = 1;
 comp_obj_heading_.metainfo.parent_ocn                          = 1;
@@ -711,8 +710,8 @@ if there is a glossary section you need to:
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "_part_glossary";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "_part_glossary";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 1;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -729,8 +728,8 @@ if there is a glossary section you need to:
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "glossary";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "glossary";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 4;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -832,8 +831,8 @@ if there is a blurb section you need to:
       comp_obj_heading_.metainfo.ocn                                 = 0;
       comp_obj_heading_.metainfo.object_number_off                   = "";
       comp_obj_heading_.metainfo.object_number_type                  = 0;
-      comp_obj_heading_.tags.segment_anchor_tag                      = "_part_blurb";
-      comp_obj_heading_.tags.segment_anchor_tag_is                   = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html                 = "_part_blurb";
+      comp_obj_heading_.tags.segment_anchor_tag_epub                 = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup                  = 1;
       comp_obj_heading_.metainfo.heading_lev_collapsed               = 1;
       comp_obj_heading_.metainfo.parent_ocn                          = 1;
@@ -850,8 +849,8 @@ if there is a blurb section you need to:
       comp_obj_heading_.metainfo.ocn                                 = 0;
       comp_obj_heading_.metainfo.object_number_off                   = "";
       comp_obj_heading_.metainfo.object_number_type                  = 0;
-      comp_obj_heading_.tags.segment_anchor_tag                      = "blurb";
-      comp_obj_heading_.tags.segment_anchor_tag_is                   = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html                 = "blurb";
+      comp_obj_heading_.tags.segment_anchor_tag_epub                 = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup                  = 4;
       comp_obj_heading_.metainfo.heading_lev_collapsed               = 2;
       comp_obj_heading_.metainfo.parent_ocn                          = 1;
@@ -871,8 +870,8 @@ if there is a blurb section you need to:
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "blurb";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "blurb";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = an_object["lev_markup_number"].to!int;    // make int, remove need to conv
       comp_obj_heading_.metainfo.heading_lev_collapsed = an_object["lev_collapsed_number"].to!int; // make int, remove need to conv
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -1200,22 +1199,22 @@ if ((obj_type_status["heading"] == State.on)
     && (!(anchor_tag.empty)
     || (tag_assoc_lv0_to_lv3_html.length > 1))
   ) {
-    segment_anchor_tag_that_object_belongs_to = anchor_tag;
+    segment_anchor_tag_that_object_belongs_to["html"] = anchor_tag;
     lev_anchor_tag = anchor_tag;
-    tag_assoc_html[anchor_tag] = [segment_anchor_tag_that_object_belongs_to];
+    tag_assoc_html[anchor_tag] = [segment_anchor_tag_that_object_belongs_to["html"]];
     if (tag_assoc_lv0_to_lv3_html.length > 1) { /+ names used for html markup segments 1 to 4 (rather than epub which has separate segments for A to D) +/
       foreach (lv0_to_lv3_html_tag; tag_assoc_lv0_to_lv3_html) {
-        tag_assoc_html[lv0_to_lv3_html_tag[0]] = [segment_anchor_tag_that_object_belongs_to];
+        tag_assoc_html[lv0_to_lv3_html_tag[0]] = [segment_anchor_tag_that_object_belongs_to["html"]];
       }
     }
-    segment_anchor_tag_that_object_belongs_to_uri = anchor_tag ~ ".fnSuffix";
+    segment_anchor_tag_that_object_belongs_to["html_uri"] = anchor_tag ~ ".fnSuffix";
     anchor_tag_ = anchor_tag;
     tag_assoc_lv0_to_lv3_html = tag_assoc_lv0_to_lv3_html.init;
   } else if (an_object["lev_markup_number"].to!int > 4) {
-    segment_anchor_tag_that_object_belongs_to = anchor_tag_;
+    segment_anchor_tag_that_object_belongs_to["html"] = anchor_tag_;
     lev_anchor_tag = anchor_tag;
-    tag_assoc_html[anchor_tag] = [segment_anchor_tag_that_object_belongs_to];
-    segment_anchor_tag_that_object_belongs_to_uri = anchor_tag_ ~ ".fnSuffix#" ~ obj_cite_digits.on.to!string;
+    tag_assoc_html[anchor_tag] = [segment_anchor_tag_that_object_belongs_to["html"]];
+    segment_anchor_tag_that_object_belongs_to["html_uri"] = anchor_tag_ ~ ".fnSuffix#" ~ obj_cite_digits.on.to!string;
   } else if (an_object["lev_markup_number"].to!int < 4) {
     string segn;
     switch (an_object["lev_markup_number"].to!int) {
@@ -1235,8 +1234,10 @@ if ((obj_type_status["heading"] == State.on)
       ++cnt3;
       goto default;
     default:
-      segment_anchor_tag_that_object_belongs_to = segn;
-      segment_anchor_tag_that_object_belongs_to_uri = segn ~ ".fnSuffix";
+      segment_anchor_tag_that_object_belongs_to["html"] = segn;
+      segment_anchor_tag_that_object_belongs_to["html_uri"] = segn ~ ".fnSuffix";
+      segment_anchor_tag_that_object_belongs_to["epub"] = segn;
+      segment_anchor_tag_that_object_belongs_to["epub_uri"] = segn ~ ".fnSuffix";
       tag_assoc_lv0_to_lv3_html[segn] = [""];
       tag_assoc_lv0_to_lv3_epub[segn] = ["segn"];
       break;
@@ -1257,7 +1258,7 @@ if ((obj_type_status["heading"] == State.on)
     the_table_of_contents_section,
   );
   if (an_object["lev_markup_number"] == "4") {
-    html_segnames ~= segment_anchor_tag_that_object_belongs_to;
+    html_segnames ~= segment_anchor_tag_that_object_belongs_to["html"];
     html_segnames_ptr = html_segnames_ptr_cntr;
     html_segnames_ptr_cntr++;
   }
@@ -1282,7 +1283,7 @@ if ((obj_type_status["heading"] == State.on)
   ++heading_ptr;
   debug(segments) {
     writeln(an_object["lev_markup_number"]);
-    writeln(segment_anchor_tag_that_object_belongs_to);
+    writeln(segment_anchor_tag_that_object_belongs_to["html"]);
   }
   the_document_body_section ~= comp_obj_heading;
   debug(objectrelated1) { // check
@@ -1330,7 +1331,7 @@ if ((obj_type_status["heading"] == State.on)
   comp_obj_para.metainfo.is_of_type                         = "para";
   comp_obj_para.metainfo.is_a                               = "para";
   comp_obj_para.text                                        = an_object["substantive"].to!string.strip;
-  comp_obj_para.tags.segment_anchor_tag_is                  = segment_anchor_tag_that_object_belongs_to;
+  comp_obj_para.tags.segment_anchor_tag_is                  = segment_anchor_tag_that_object_belongs_to["html"];
   comp_obj_para.metainfo.ocn                                = obj_cite_digits.digit;
   comp_obj_para.metainfo.object_number_off                  = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
   comp_obj_para.metainfo.o_n_book_index                     = obj_cite_digits.bkidx;
@@ -1493,8 +1494,8 @@ if (biblio_ordered.length > 0) {
   comp_obj_heading_.metainfo.ocn                   = 0;
   comp_obj_heading_.metainfo.object_number_off     = "";
   comp_obj_heading_.metainfo.object_number_type    = 0;
-  comp_obj_heading_.tags.segment_anchor_tag        = "_part_bibliography";
-  comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+  comp_obj_heading_.tags.segment_anchor_tag_html   = "_part_bibliography";
+  comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
   comp_obj_heading_.metainfo.heading_lev_markup    = 1;
   comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
   comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -1509,8 +1510,8 @@ if (biblio_ordered.length > 0) {
   comp_obj_heading_.metainfo.ocn                   = 0;
   comp_obj_heading_.metainfo.object_number_off     = "";
   comp_obj_heading_.metainfo.object_number_type    = 0;
-  comp_obj_heading_.tags.segment_anchor_tag        = "bibliography";
-  comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+  comp_obj_heading_.tags.segment_anchor_tag_html   = "bibliography";
+  comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
   comp_obj_heading_.metainfo.heading_lev_markup    = 4;
   comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
   comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -1649,8 +1650,8 @@ if (an_object["blurb_nugget"].length == 0) {
   comp_obj_heading_.metainfo.ocn                   = 0;
   comp_obj_para.metainfo.object_number_off         = "";
   comp_obj_para.metainfo.object_number_type        = 0;
-  comp_obj_heading_.tags.segment_anchor_tag        = "";
-  comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+  comp_obj_heading_.tags.segment_anchor_tag_html   = "";
+  comp_obj_heading_.tags.segment_anchor_tag_epub   = "";
   comp_obj_heading_.metainfo.heading_lev_markup    = 1;
   comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
   comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -2310,7 +2311,7 @@ foreach (ref obj; the_document_head_section) {
       writeln(obj.text);
     }
     if (obj.metainfo.heading_lev_markup <= 4) {
-      segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+      segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
     }
     if (obj.metainfo.heading_lev_markup == 0) {
       /+ TODO second hit (of two) with same assertion failure, check, fix and reinstate
@@ -2346,11 +2347,10 @@ if (the_table_of_contents_section["scroll"].length > 1) {
   foreach (ref obj; the_table_of_contents_section["scroll"]) {
     if (obj.metainfo.is_a == "heading") {
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2375,11 +2375,11 @@ if (the_table_of_contents_section["scroll"].length > 1) {
         writeln(obj.text);
       }
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       if ((opt_action.html)
@@ -2407,15 +2407,15 @@ if (the_document_body_section.length > 1) {
         writeln(obj.text);
       }
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
-          obj.tags.lev4_subtoc = lev4_subtoc[obj.tags.segment_anchor_tag];
+          obj.tags.lev4_subtoc = lev4_subtoc[obj.tags.segment_anchor_tag_html];
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2458,14 +2458,14 @@ if (the_endnotes_section.length > 1) {
       obj_cite_digits = ocn_emit(OCNstatus.on);
       obj.metainfo.ocn = obj_cite_digits.digit;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2500,14 +2500,14 @@ if (the_glossary_section.length > 1) {
       obj_cite_digits = ocn_emit(OCNstatus.on);
       obj.metainfo.ocn = obj_cite_digits.digit;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2545,14 +2545,14 @@ if (the_bibliography_section.length > 1) {
       obj_cite_digits = ocn_emit(OCNstatus.on);
       obj.metainfo.ocn = obj_cite_digits.digit;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2595,14 +2595,13 @@ if (the_bookindex_section["scroll"].length > 1) {
       obj_cite_digits = ocn_emit(OCNstatus.on);
       obj.metainfo.ocn = obj_cite_digits.on;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2633,14 +2632,14 @@ if (the_bookindex_section["scroll"].length > 1) {
       }
       obj.metainfo.ocn = ++ocn_;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2681,14 +2680,14 @@ if (the_blurb_section.length > 1) {
       obj_cite_digits = ocn_emit(OCNstatus.on);
       obj.metainfo.ocn = obj_cite_digits.on;
       if (obj.metainfo.heading_lev_markup <= 4) {
-        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag;
+        segnames_lv0_to_4 ~= obj.tags.segment_anchor_tag_epub;
         if (obj.metainfo.heading_lev_markup == 4) {
           obj.tags.segname_prev = html_segnames[obj.ptr.html_segnames - 1];
           if (html_segnames.length > obj.ptr.html_segnames + 1) {
             obj.tags.segname_next = html_segnames[obj.ptr.html_segnames + 1];
           }
-          assert(obj.tags.segment_anchor_tag == html_segnames[obj.ptr.html_segnames],
-            obj.tags.segment_anchor_tag ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
+          assert(obj.tags.segment_anchor_tag_html == html_segnames[obj.ptr.html_segnames],
+            obj.tags.segment_anchor_tag_html ~ "!=" ~ html_segnames[obj.ptr.html_segnames]);
         }
       }
       /+ dom structure (marked up & collapsed) +/
@@ -2827,7 +2826,9 @@ comp_obj_heading_.metainfo.is_a                  = "heading";
 comp_obj_heading_.metainfo.ocn                   = 0;
 comp_obj_para.metainfo.object_number_off         = "";
 comp_obj_para.metainfo.object_number_type        = 0;
-comp_obj_heading_.tags.segment_anchor_tag        = "";
+comp_obj_heading_.tags.segment_anchor_tag_html   = "";
+comp_obj_heading_.tags.segment_anchor_tag_epub   = "";
+comp_obj_heading_.tags.segment_anchor_tag_is     = "";
 comp_obj_heading_.metainfo.heading_lev_markup    = 9;
 comp_obj_heading_.metainfo.heading_lev_collapsed = 9;
 comp_obj_heading_.metainfo.parent_ocn            = 0;
@@ -3820,7 +3821,7 @@ void _poem_block_(L,O,T,C,N,CMM,Ts)(
           comp_obj_block.metainfo.is_a                 = "verse";
           comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
           comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-          comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+          comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
           comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
           comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
           comp_obj_block.text                          = an_object["substantive"];
@@ -3881,7 +3882,7 @@ void _poem_block_(L,O,T,C,N,CMM,Ts)(
         comp_obj_block.metainfo.is_a                 = "verse";
         comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
         comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
         comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
         comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
         comp_obj_block.text                          = an_object["substantive"];
@@ -3925,7 +3926,7 @@ void _poem_block_(L,O,T,C,N,CMM,Ts)(
         comp_obj_block.metainfo.is_a                 = "verse";
         comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
         comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
         comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
         comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
         comp_obj_block.text                          = an_object["substantive"];
@@ -3986,7 +3987,7 @@ void _poem_block_(L,O,T,C,N,CMM,Ts)(
         comp_obj_block.metainfo.is_a                 = "verse";
         comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
         comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+        comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
         comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
         comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
         comp_obj_block.text                          = an_object["substantive"];
@@ -4127,7 +4128,7 @@ void _table_closed_make_special_notation_table_(N,CMM)(
     an_object["substantive"]                     = substantive_obj_misc_tuple[sObj.content];
     comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
     comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
     comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
     comp_obj_block                               = table_instructions(comp_obj_block, an_object["table_head"]);
@@ -4209,7 +4210,7 @@ void _block_flag_line_empty_(B,N,CMM,Ts)(
     comp_obj_block.metainfo.is_a                 = "quote";
     comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
     comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
     comp_obj_block.metainfo.object_number_type   = obj_cite_digit_type;
     comp_obj_block.text                          = an_object["substantive"];
@@ -4262,7 +4263,7 @@ void _block_flag_line_empty_(B,N,CMM,Ts)(
     comp_obj_block.metainfo.is_a                 = "group";
     comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
     comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
     comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
     comp_obj_block.text                          = an_object["substantive"];
@@ -4313,7 +4314,7 @@ void _block_flag_line_empty_(B,N,CMM,Ts)(
     comp_obj_block.metainfo.is_a                 = "block";
     comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
     comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
     comp_obj_block.metainfo.object_number_type   = obj_cite_digit_type;
     comp_obj_block.text                          = an_object["substantive"];
@@ -4407,7 +4408,7 @@ void _block_flag_line_empty_(B,N,CMM,Ts)(
     comp_obj_code.metainfo.is_a                  = "code";
     comp_obj_code.metainfo.ocn                   = obj_cite_digits.on;
     comp_obj_code.metainfo.object_number_off     = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_code.tags.segment_anchor_tag_is     = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_code.tags.segment_anchor_tag_is     = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_code.metainfo.o_n_book_index        = obj_cite_digits.bkidx;
     comp_obj_code.metainfo.object_number_type    = obj_cite_digits.type;
     comp_obj_code.text                           = an_object["substantive"];
@@ -4455,7 +4456,7 @@ void _block_flag_line_empty_(B,N,CMM,Ts)(
     comp_obj_block                               = comp_obj_block.init;
     comp_obj_block.metainfo.ocn                  = obj_cite_digits.on;
     comp_obj_block.metainfo.object_number_off    = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
-    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to;
+    comp_obj_block.tags.segment_anchor_tag_is    = segment_anchor_tag_that_object_belongs_to["html"];
     comp_obj_block.metainfo.o_n_book_index       = obj_cite_digits.bkidx;
     comp_obj_block.metainfo.object_number_type   = obj_cite_digits.type;
     comp_obj_block                               = table_instructions(comp_obj_block, an_object["table_head"]);
@@ -5865,7 +5866,7 @@ static struct ObjInlineMarkup {
   in {
     debug(asserts) {
       static assert(is(typeof(obj_)                                      == string[string]));
-      static assert(is(typeof(segment_anchor_tag_that_object_belongs_to) == string));
+      static assert(is(typeof(segment_anchor_tag_that_object_belongs_to) == string[string]));
       static assert(is(typeof(_anchor_tag)                               == string));
       static assert(is(typeof(lev4_subtoc)                               == string[][string]));
       static assert(is(typeof(the_table_of_contents_section)             == ObjGenericComposite[][string]));
@@ -5970,10 +5971,10 @@ static struct ObjInlineMarkup {
         "{ %s }%s%s%s",
         heading_toc_,
         mkup.mark_internal_site_lnk,
-        segment_anchor_tag_that_object_belongs_to,
+        segment_anchor_tag_that_object_belongs_to["html"],
         ".fnSuffix",
       );
-      lev4_subtoc[segment_anchor_tag_that_object_belongs_to] = [];
+      lev4_subtoc[segment_anchor_tag_that_object_belongs_to["html"]] = [];
       toc_txt_= munge.url_links(toc_txt_);
       indent=[
         "hang_position" : obj_["lev_markup_number"].to!int,
@@ -5990,7 +5991,7 @@ static struct ObjInlineMarkup {
         "{ %s }%s%s%s#%s",
         heading_toc_,
         mkup.mark_internal_site_lnk,
-        segment_anchor_tag_that_object_belongs_to,
+        segment_anchor_tag_that_object_belongs_to["html"],
         ".fnSuffix",
         _anchor_tag,
       );
@@ -5999,7 +6000,7 @@ static struct ObjInlineMarkup {
         heading_toc_,
         _anchor_tag,
       );
-      lev4_subtoc[segment_anchor_tag_that_object_belongs_to]
+      lev4_subtoc[segment_anchor_tag_that_object_belongs_to["html"]]
       ~= munge.url_links(obj_["lev_markup_number"]
            ~ "~ " ~ subtoc_txt_.to!string.strip
          );
@@ -6610,7 +6611,7 @@ struct BookIndexNuggetHash {
   string[][string][string] bookindex_nugget_hash(BI,N,S)(
     BI bookindex_section,
     N  obj_cite_digits,
-    S  segment_anchor_tag,
+    S  segment_anchor_tag_that_object_belongs_to,
   )
   in {
     debug(asserts) {
@@ -6621,7 +6622,7 @@ struct BookIndexNuggetHash {
       if (!bookindex_section.empty) {
         writeln(
           "* [bookindex] ",
-          "[", obj_cite_digits.on.to!string, ": ", segment_anchor_tag, "] ", bookindex_section
+          "[", obj_cite_digits.on.to!string, ": ", segment_anchor_tag_that_object_belongs_to["html"], "] ", bookindex_section
         );
       }
     }
@@ -6642,11 +6643,11 @@ struct BookIndexNuggetHash {
           object_number_endpoint=(obj_cite_digits.on + object_number_offset);
           object_numbers ~= (obj_cite_digits.on.to!string
           ~ "-" ~ object_number_endpoint.to!string
-          ~ ":" ~ segment_anchor_tag);
+          ~ ":" ~ segment_anchor_tag_that_object_belongs_to["html"]);
         } else {
           main_term = bi_main_term_and_rest[0].strip;
           object_numbers ~= obj_cite_digits.on.to!string
-          ~ ":" ~ segment_anchor_tag;
+          ~ ":" ~ segment_anchor_tag_that_object_belongs_to["html"];
         }
         bi[main_term]["_a"] ~= object_numbers;
         object_numbers=null;
@@ -6662,11 +6663,11 @@ struct BookIndexNuggetHash {
               object_number_endpoint=(obj_cite_digits.on + object_number_offset);
               object_numbers ~= (obj_cite_digits.on.to!string
               ~ " - " ~ object_number_endpoint.to!string
-              ~ ":" ~ segment_anchor_tag);
+              ~ ":" ~ segment_anchor_tag_that_object_belongs_to["html"]);
             } else {
               sub_term = sub_terms_bits.strip;
               object_numbers ~= obj_cite_digits.on.to!string
-              ~ ":" ~ segment_anchor_tag;
+              ~ ":" ~ segment_anchor_tag_that_object_belongs_to["html"];
             }
             if (!empty(sub_term)) {
               bi[main_term][sub_term] ~= object_numbers;
@@ -6806,8 +6807,8 @@ struct BookIndexReportSection {
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "_part_book_index";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "_part_book_index";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 1;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -6825,8 +6826,8 @@ struct BookIndexReportSection {
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "bookindex";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "bookindex";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 4;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -6925,7 +6926,10 @@ struct BookIndexReportSection {
       bookindex_section["scroll"]                      ~= comp_obj_heading_;
       bookindex_section["seg"]                         ~= comp_obj_heading_;
     }
-    auto t = tuple(bookindex_section, obj_cite_digits);
+    auto t = tuple(
+      bookindex_section,
+      obj_cite_digits
+    );
     return t;
   }
 #+END_SRC
@@ -6954,7 +6958,7 @@ struct NotesSection {
 #+BEGIN_SRC d
   private auto gather_notes_for_endnote_section(
     ObjGenericComposite[] contents_am,
-    string                segment_anchor_tag_that_object_belongs_to,
+    string[string]        segment_anchor_tag_that_object_belongs_to,
     int                   cntr,
   )
   in {
@@ -6985,13 +6989,13 @@ struct NotesSection {
         writeln(
           "{^{", m.captures[1], ".}^}"
           ~ mkup.mark_internal_site_lnk,
-          segment_anchor_tag_that_object_belongs_to,
+          segment_anchor_tag_that_object_belongs_to["html"],
             ".fnSuffix#noteref_\n  ", m.captures[1], " ",
           m.captures[2]); // sometimes need segment name (segmented html & epub)
       }
       // you need anchor for segments at this point ->
       object_notes["anchor"] ~= "note_" ~ m.captures[1] ~ "』";
-      object_notes["notes"] ~= (segment_anchor_tag_that_object_belongs_to.empty)
+      object_notes["notes"] ~= (segment_anchor_tag_that_object_belongs_to["html"].empty)
       ? (munge.url_links(
           "{^{" ~ m.captures[1] ~ ".}^}#noteref_"
           ~ m.captures[1]) ~ " "
@@ -7000,7 +7004,7 @@ struct NotesSection {
       : (munge.url_links(
           "{^{" ~ m.captures[1] ~ ".}^}"
            ~ mkup.mark_internal_site_lnk
-           ~ segment_anchor_tag_that_object_belongs_to
+           ~ segment_anchor_tag_that_object_belongs_to["html"]
            ~ ".fnSuffix#noteref_"
            ~ m.captures[1]) ~ " "
            ~ m.captures[2] ~ "』"
@@ -7060,8 +7064,8 @@ struct NotesSection {
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "_part_endnotes";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "_part_endnotes";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 1;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 1;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -7077,8 +7081,8 @@ struct NotesSection {
       comp_obj_heading_.metainfo.ocn                   = 0;
       comp_obj_heading_.metainfo.object_number_off     = "";
       comp_obj_heading_.metainfo.object_number_type    = 0;
-      comp_obj_heading_.tags.segment_anchor_tag        = "endnotes";
-      comp_obj_heading_.tags.segment_anchor_tag_is     = comp_obj_heading_.tags.segment_anchor_tag;
+      comp_obj_heading_.tags.segment_anchor_tag_html   = "endnotes";
+      comp_obj_heading_.tags.segment_anchor_tag_epub   = comp_obj_heading_.tags.segment_anchor_tag_html;
       comp_obj_heading_.metainfo.heading_lev_markup    = 4;
       comp_obj_heading_.metainfo.heading_lev_collapsed = 2;
       comp_obj_heading_.metainfo.parent_ocn            = 1;
@@ -7291,7 +7295,7 @@ struct NodeStructureMetadata {
 #+BEGIN_SRC d
   ObjGenericComposite node_location_emitter(Lv,Tg,La,Ta,N,C,P,I)(
     Lv lev_markup_number,
-    Tg segment_anchor_tag,
+    Tg segment_anchor_tag_that_object_belongs_to,
     La lev_anchor_tag,
     Ta tag_assoc_html,
     N  obj_cite_digits,
@@ -7302,7 +7306,7 @@ struct NodeStructureMetadata {
   in {
     debug(asserts) {
       static assert(is(typeof(lev_markup_number)  == string));
-      static assert(is(typeof(segment_anchor_tag) == string));
+      static assert(is(typeof(segment_anchor_tag_that_object_belongs_to) == string[string]));
       static assert(is(typeof(obj_cite_digits.on) == int));
       static assert(is(typeof(cntr_)              == int));
       static assert(is(typeof(ptr_)               == int));
@@ -7331,8 +7335,8 @@ struct NodeStructureMetadata {
     comp_obj_location                             = comp_obj_location.init;
     comp_obj_location.metainfo.is_a               = is_;
     comp_obj_location.metainfo.ocn                = obj_cite_digits.on;
-    comp_obj_location.tags.segment_anchor_tag     = segment_anchor_tag.to!string;
-    comp_obj_location.tags.segment_anchor_tag_is  = comp_obj_location.tags.segment_anchor_tag;
+    comp_obj_location.tags.segment_anchor_tag_html = segment_anchor_tag_that_object_belongs_to["html"];
+    comp_obj_location.tags.segment_anchor_tag_epub = segment_anchor_tag_that_object_belongs_to["epub"];
     comp_obj_location.tags.heading_lev_anchor_tag = lev_anchor_tag;
     comp_obj_location.metainfo.parent_ocn         = p_["object_number"];
     comp_obj_location.metainfo.parent_lev_markup  = p_["lev_markup_number"];
@@ -7379,7 +7383,7 @@ struct NodeStructureMetadata {
       static assert(is(typeof(lev)                                       == string));
       static assert(is(typeof(lev_markup_number)                         == string));
       static assert(is(typeof(lev_collapsed_number)                      == string));
-      static assert(is(typeof(segment_anchor_tag_that_object_belongs_to) == string));
+      static assert(is(typeof(segment_anchor_tag_that_object_belongs_to) == string[string]));
       static assert(is(typeof(obj_cite_digits.on)                        == int));
       static assert(is(typeof(cntr_)                                     == int));
       static assert(is(typeof(ptr_)                                      == int));
@@ -7497,9 +7501,10 @@ struct NodeStructureMetadata {
     _comp_obj_heading_.metainfo.ocn                     = obj_cite_digits.on;
     _comp_obj_heading_.metainfo.object_number_off       = (obj_cite_digits.off==0)   ? "" : obj_cite_digits.off.to!string;
     _comp_obj_heading_.metainfo.object_number_type      = obj_cite_digits.type;
-    _comp_obj_heading_.tags.segment_anchor_tag          = segment_anchor_tag_that_object_belongs_to;
+    _comp_obj_heading_.tags.segment_anchor_tag_html     = segment_anchor_tag_that_object_belongs_to["html"];
+    _comp_obj_heading_.tags.segment_anchor_tag_epub     = _comp_obj_heading_.tags.segment_anchor_tag_html;
     _comp_obj_heading_.tags.heading_lev_anchor_tag      = lev_anchor_tag;
-    _comp_obj_heading_.tags.segment_anchor_tag_is       = segment_anchor_tag_that_object_belongs_to;
+    _comp_obj_heading_.tags.segment_anchor_tag_is       = segment_anchor_tag_that_object_belongs_to["html"];
     _comp_obj_heading_.metainfo.heading_lev_markup      = (!(lev_markup_number.empty) ? lev_markup_number.to!int : 0);
     _comp_obj_heading_.metainfo.heading_lev_collapsed   = (!(lev_collapsed_number.empty) ? lev_collapsed_number.to!int : 0);
     _comp_obj_heading_.metainfo.parent_ocn              = p_["object_number"];
@@ -7939,7 +7944,8 @@ struct DocObj_Pointer_ {
 }
 struct DocObj_Tags_ {
   string[]               heading_ancestors_text              = [ "", "", "", "", "", "", "", "", ]; // TODO redundant? see markedup and collapsed ancestors DONE
-  string                 segment_anchor_tag                  = "";
+  string                 segment_anchor_tag_html             = "";
+  string                 segment_anchor_tag_epub             = "";
   string                 segment_anchor_tag_is               = "";
   string                 heading_lev_anchor_tag              = "";
   string                 segname_prev                        = "";
diff --git a/org/meta_debugs.org b/org/meta_debugs.org
index 687e1b2..b6e94d4 100644
--- a/org/meta_debugs.org
+++ b/org/meta_debugs.org
@@ -305,12 +305,12 @@ debug(toc_nav_dom) {
             writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
             writeln(markup.indent_by_spaces_provided(k),
               "<", k, ">", obj.text,
-              " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
+              " file: ", obj.segment_anchor_tag_html, ".xhtml#", obj.ocn);
             break;
           case DomTags.open :
             writeln(markup.indent_by_spaces_provided(k),
               "<", k, ">", obj.text,
-              " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
+              " file: ", obj.segment_anchor_tag_html, ".xhtml#", obj.ocn);
             break;
           default :
             break;
@@ -332,12 +332,12 @@ debug(toc_nav_dom) {
             writeln(markup.indent_by_spaces_provided(k), "</", k, ">");
             writeln(markup.indent_by_spaces_provided(k),
               "<", k, ">", obj.text,
-              " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
+              " file: ", obj.segment_anchor_tag_html, ".xhtml#", obj.ocn);
             break;
           case DomTags.open :
             writeln(markup.indent_by_spaces_provided(k),
               "<", k, ">", obj.text,
-              " file: ", obj.segment_anchor_tag, ".xhtml#", obj.ocn);
+              " file: ", obj.segment_anchor_tag_html, ".xhtml#", obj.ocn);
             break;
           default :
             break;
diff --git a/org/output_xmls.org b/org/output_xmls.org
index 12b37a1..060a75c 100644
--- a/org/output_xmls.org
+++ b/org/output_xmls.org
@@ -683,7 +683,7 @@ auto nav_pre_next_svg(M,O)(
   const        O    obj,
 ) {
   string prev, next, toc;
-  if (obj.tags.segment_anchor_tag == "toc") {
+  if (obj.tags.segment_anchor_tag_epub == "toc") {
     toc = "";
     prev = "";
   } else {
@@ -1654,7 +1654,7 @@ void seg(D,M)(
           }
           break;
         case 4:
-          segment_filename = obj.tags.segment_anchor_tag;
+          segment_filename = obj.tags.segment_anchor_tag_epub;
           doc_html[segment_filename] ~= xhtml_format.html_head(doc_matters, "seg");
           auto navigation_bar = xhtml_format.nav_pre_next_svg(doc_matters, obj);
           doc_html[segment_filename] ~= navigation_bar.toc_pre_next;
@@ -2077,14 +2077,14 @@ string epub3_oebps_content(D,M,P)(D doc_abstraction, M doc_matters, P parts) {
             writefln(
               "%s~ [%s.xhtml] %s",
               obj.marked_up_level,
-              obj.tags.segment_anchor_tag,
+              obj.tags.segment_anchor_tag_epub,
               obj.text
             );
           } else if (obj.metainfo.heading_lev_markup > 4) {
             writefln(
               "%s~ [%s.xhtml#%s] %s",
               obj.marked_up_level,
-              obj.tags.segment_anchor_tag,
+              obj.tags.segment_anchor_tag_epub,
               obj.metainfo.object_number,
               obj.text
             );
@@ -2136,7 +2136,7 @@ string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
             if  (obj.metainfo.heading_lev_markup < 4) {
               toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
               ~ markup.indent_by_spaces_provided((n + 2), "  ")
-              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_is ~ ".xhtml" ~ "\">"
+              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_epub ~ ".xhtml" ~ "\">"
               ~ _txt
               ~ "</a>" ~ "\n";
             } else {
@@ -2145,7 +2145,7 @@ string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
               : ("#" ~ obj.metainfo.ocn.to!string);
               toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
               ~ markup.indent_by_spaces_provided((n + 2), "  ")
-              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_is ~ ".xhtml" ~ hashtag ~ "\">"
+              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_epub ~ ".xhtml" ~ hashtag ~ "\">"
               ~ _txt
               ~ "</a>" ~ "\n";
             }
@@ -2155,7 +2155,7 @@ string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
             if  (obj.metainfo.heading_lev_markup < 4) {
               toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
               ~ markup.indent_by_spaces_provided((n + 2), "  ")
-              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_is ~ ".xhtml" ~ "\">"
+              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_epub ~ ".xhtml" ~ "\">"
               ~ _txt
               ~ "</a>" ~ "\n";
             } else {
@@ -2164,7 +2164,7 @@ string epub3_oebps_toc_nav_xhtml(D,I)(D doc_abstraction, I doc_matters) {
               : ("#" ~ obj.metainfo.ocn.to!string);
               toc ~= markup.indent_by_spaces_provided((n + 1), "  ") ~ "<li>" ~ "\n"
               ~ markup.indent_by_spaces_provided((n + 2), "  ")
-              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_is ~ ".xhtml" ~ hashtag ~ "\">"
+              ~ "<a href=\"" ~ obj.tags.segment_anchor_tag_epub ~ ".xhtml" ~ hashtag ~ "\">"
               ~ _txt
               ~ "</a>" ~ "\n";
             }
@@ -2247,7 +2247,7 @@ string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
     <content src="%s.xhtml%s" />¶",
               counter,
               _txt,
-              obj.tags.segment_anchor_tag_is,
+              obj.tags.segment_anchor_tag_epub,
               hashtag,
             );
             break;
@@ -2261,7 +2261,7 @@ string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
     <content src="%s.xhtml%s" />¶",
               counter,
               _txt,
-              obj.tags.segment_anchor_tag_is,
+              obj.tags.segment_anchor_tag_epub,
               hashtag,
             );
             break;
@@ -2326,16 +2326,16 @@ void outputEPub3(D,I)(
             top_level_headings[3] = "";
             goto default;
           default:
-            doc_parts_ ~= obj.tags.segment_anchor_tag;
-            doc_epub3[obj.tags.segment_anchor_tag] ~= xhtml_format.epub3_seg_head(doc_matters);
+            doc_parts_ ~= obj.tags.segment_anchor_tag_epub;
+            doc_epub3[obj.tags.segment_anchor_tag_epub] ~= xhtml_format.epub3_seg_head(doc_matters);
             auto t = xhtml_format.heading_seg(doc_matters, obj, _txt, suffix, "epub");
-            doc_epub3[obj.tags.segment_anchor_tag] ~= t[0];
-            doc_epub3_endnotes[obj.tags.segment_anchor_tag] ~= t[1];
+            doc_epub3[obj.tags.segment_anchor_tag_epub] ~= t[0];
+            doc_epub3_endnotes[obj.tags.segment_anchor_tag_epub] ~= t[1];
             break;
           }
           break;
         case 4:
-          segment_filename = obj.tags.segment_anchor_tag;
+          segment_filename = obj.tags.segment_anchor_tag_epub;
           doc_epub3[segment_filename] ~= xhtml_format.epub3_seg_head(doc_matters);
           auto t = xhtml_format.heading_seg(doc_matters, obj, _txt, suffix, "epub");
           doc_epub3[segment_filename] ~= t[0];
@@ -2503,41 +2503,41 @@ void outputEPub3(D,I)(
           oepbs_content_parts["manifest_documents"] ~=
             format(q"¶      <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
 ¶",
-            obj.tags.segment_anchor_tag_is,
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
+            obj.tags.segment_anchor_tag_epub,
           );
           oepbs_content_parts["spine"] ~=
             format(q"¶    <itemref idref="%s.xhtml" linear="yes" />
 ¶",
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
           );
           oepbs_content_parts["guide"] ~=
             format(q"¶      <reference type="%s" href="%s" />
 ¶",
-            obj.tags.segment_anchor_tag_is,
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
+            obj.tags.segment_anchor_tag_epub,
           );
         } else if (obj.metainfo.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.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
             obj.metainfo.object_number,
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
             obj.metainfo.object_number,
           );
           oepbs_content_parts["spine"] ~=
             format(q"¶    <itemref idref="%s.xhtml#%s" linear="yes" />
 ¶",
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
             obj.metainfo.object_number,
           );
           oepbs_content_parts["guide"] ~=
             format(q"¶      <reference type="%s#%s" href="%s#%s" />
 ¶",
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
             obj.metainfo.object_number,
-            obj.tags.segment_anchor_tag_is,
+            obj.tags.segment_anchor_tag_epub,
             obj.metainfo.object_number,
           );
         }