start work on node info, a way to go

7 files changed, 554 insertions, 224 deletions

diff --git a/org/ao_abstract_doc_source.org b/org/ao_abstract_doc_source.org
index cec9f08..63daac5 100644
--- a/org/ao_abstract_doc_source.org
+++ b/org/ao_abstract_doc_source.org
@@ -97,11 +97,14 @@ int obj_cite_number_emit(int obj_cite_number_status_flag) {
 string book_idx_tmp;
 string[][string][string] bookindex_unordered_hashes;
 auto bookindex_extract_hash = BookIndexNuggetHash();
-string[][string][string] bkidx_hash(string bookindex_section, int obj_cite_number) {
+string[][string][string] bkidx_hash(
+  string bookindex_section,
+  int obj_cite_number
+) {
   return bookindex_extract_hash.bookindex_nugget_hash(bookindex_section, obj_cite_number);
 }
 /+ node +/
-string _node;
+string[string][string] _node;
 auto node_construct = NodeStructureMetadata();
 #+END_SRC
 
@@ -128,6 +131,7 @@ scope(exit) {
 
 #+name: abs_init_rest
 #+BEGIN_SRC d
+auto node_ = node_metadata;
 line_occur = [
   "heading"  : 0,
   "para"     : 0,
@@ -135,13 +139,6 @@ line_occur = [
   "blurb"    : 0,
 ];
 auto type = flags_type_init;
-void tell_lo(int obj_cite_number, in char[] line) {
-  writefln(
-    "* %s %s",
-    to!string(obj_cite_number),
-    to!string(line)
-  );
-}
 string[string] obj_cite_number_poem = [
   "start" : "",
   "end"   : ""
@@ -192,6 +189,11 @@ string _anchor_tag;
 string toc_txt_;
 an_object["glossary_nugget"] = "";
 an_object["blurb_nugget"] = "";
+node_["object"]["is"]                       = "heading";
+node_["object"]["obj_cite_number"]          = "0";
+node_["object"]["segment_anchor_tag"]       = "toc";
+node_["object"]["parent_obj_cite_number"]   = "1";
+node_["object"]["parent_lev_markup_number"] = "0";
 auto toc_head =
   set_abstract_object.contents_heading(
     "Table of Contents", // nugget/object
@@ -201,6 +203,7 @@ auto toc_head =
     "1",                 // lev
     4,                   // lev_int_markup
     2,                   // lev_int_collapsed
+    node_,
   );
 the_table_of_contents_section = [
   "seg": [toc_head],
@@ -322,6 +325,11 @@ if there is a glossary section you need to:
     line_occur["para"] = State.off;
     an_object_key="glossary_nugget"; //
     if (matchFirst(line, rgx.heading_glossary)) {
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "glossary";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_glossary_section ~=
         set_abstract_object.contents_heading(
           "Glossary",       // nugget/object
@@ -331,7 +339,13 @@ if there is a glossary section you need to:
           "B",              // lev
           1,                // lev_int_markup
           1,                // lev_int_collapsed
+          node_,
         );
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "glossary";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_glossary_section ~=
         set_abstract_object.contents_heading(
           "Glossary",       // nugget/object
@@ -341,6 +355,7 @@ if there is a glossary section you need to:
           "1",              // lev
           4,                // lev_int_markup
           2,                // lev_int_collapsed
+          node_,
         );
     // } else if (matchFirst(line, rgx.heading)) {
     //   _heading_matched_(line, line_occur, an_object, an_object_key, lv, collapsed_lev, type, dochead_meta_aa); // levels?
@@ -396,6 +411,11 @@ if there is a blurb section you need to:
     line_occur["para"] = State.off;
     an_object_key="blurb_nugget";
     if (matchFirst(line, rgx.heading_blurb)) {
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "blurb";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_blurb_section ~=
         set_abstract_object.contents_heading(
           "Blurb",          // nugget/object
@@ -405,7 +425,13 @@ if there is a blurb section you need to:
           "B",              // lev
           1,                // lev_int_markup
           1,                // lev_int_collapsed
+          node_,
         );
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "blurb";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_blurb_section ~=
         set_abstract_object.contents_heading(
           "Blurb",          // nugget/object
@@ -415,10 +441,16 @@ if there is a blurb section you need to:
           "1",              // lev
           4,                // lev_int_markup
           2,                // lev_int_collapsed
+          node_,
         );
     } else if ((matchFirst(line, rgx.heading))
-      && (opt_action_bool["backmatter"] && opt_action_bool["section_blurb"])) {
+    && (opt_action_bool["backmatter"] && opt_action_bool["section_blurb"])) {
       _heading_matched_(line, line_occur, an_object, an_object_key, lv, collapsed_lev, type, dochead_meta_aa); // levels?
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "blurb";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_blurb_section ~=
         set_abstract_object.contents_heading(
           to!string(line),           //  an_object["substantive"],
@@ -428,6 +460,7 @@ if there is a blurb section you need to:
           to!string(an_object["lev"]),
           to!int(an_object["lev_markup_number"]),
           to!int(an_object["lev_collapsed_number"]),
+          node_,
         );
     } else {
       _para_match_(line, an_object, an_object_key, indent, bullet, type, line_occur);
@@ -755,6 +788,7 @@ if ((type["heading"] == State.on)
       to!string(an_object["lev"]),
       to!int(an_object["lev_markup_number"]),
       to!int(an_object["lev_collapsed_number"]),
+      _node,
     );
   // track previous heading and make assertions
   debug(objectrelated1) { // check
@@ -876,7 +910,7 @@ debug(objectrelated2) { // check
 #+END_SRC
 
 *** document sections
-**** DONE endnotes section (scroll & seg)                          :endnotes:
+**** endnotes section (scroll & seg)                          :endnotes:
 
 #+name: abs_post
 #+BEGIN_SRC d
@@ -897,12 +931,17 @@ debug(endnotes) {
 }
 #+END_SRC
 
-**** DONE glossary section?
+**** glossary section?
 
 #+name: abs_post
 #+BEGIN_SRC d
 if (an_object["glossary_nugget"].length == 0) {
   writeln("no gloss");
+  node_["object"]["is"]                       = "heading";
+  node_["object"]["obj_cite_number"]          = "0";
+  node_["object"]["segment_anchor_tag"]       = "glossary";
+  node_["object"]["parent_obj_cite_number"]   = "1";
+  node_["object"]["parent_lev_markup_number"] = "0";
   the_glossary_section ~=
     set_abstract_object.contents_heading(
       "(skip) there is no Glossary section",   // nugget/object
@@ -912,6 +951,7 @@ if (an_object["glossary_nugget"].length == 0) {
       "B",              // lev
       1,                // lev_int_markup
       1,                // lev_int_collapsed
+      node_,
     );
 } else {
   writeln("gloss");
@@ -923,7 +963,7 @@ debug(glossary) {
 }
 #+END_SRC
 
-**** DONE [#B] bibliography section (objects)                  :bibliography:
+**** [#B] bibliography section (objects)                  :bibliography:
 
 #+name: abs_post
 #+BEGIN_SRC d
@@ -937,6 +977,11 @@ auto biblio_ordered =
 #+name: abs_post
 #+BEGIN_SRC d
 if (biblio_ordered.length > 0) {
+  node_["object"]["is"]                       = "heading";
+  node_["object"]["obj_cite_number"]          = "0";
+  node_["object"]["segment_anchor_tag"]       = "bibliography";
+  node_["object"]["parent_obj_cite_number"]   = "1";
+  node_["object"]["parent_lev_markup_number"] = "0";
   the_bibliography_section ~=
     set_abstract_object.contents_heading(
       "Bibliography",   // nugget/object
@@ -946,7 +991,13 @@ if (biblio_ordered.length > 0) {
       "B",              // lev
       1,                // lev_int_markup
       1,                // lev_int_collapsed
+      node_,
     );
+  node_["object"]["is"]                       = "heading";
+  node_["object"]["obj_cite_number"]          = "0";
+  node_["object"]["segment_anchor_tag"]       = "bibliography";
+  node_["object"]["parent_obj_cite_number"]   = "1";
+  node_["object"]["parent_lev_markup_number"] = "0";
   the_bibliography_section ~=
     set_abstract_object.contents_heading(
       "Bibliography",   // nugget/object
@@ -956,8 +1007,14 @@ if (biblio_ordered.length > 0) {
       "1",              // lev
       4,                // lev_int_markup
       2,                // lev_int_collapsed
+      node_,
     );
 } else {
+  node_["object"]["is"]                       = "heading";
+  node_["object"]["obj_cite_number"]          = "0";
+  node_["object"]["segment_anchor_tag"]       = "bibliography";
+  node_["object"]["parent_obj_cite_number"]   = "1";
+  node_["object"]["parent_lev_markup_number"] = "0";
   the_bibliography_section ~=
     set_abstract_object.contents_heading(
       "(skip) there is no Bibliography",   // nugget/object
@@ -967,6 +1024,7 @@ if (biblio_ordered.length > 0) {
       "B",              // lev
       1,                // lev_int_markup
       1,                // lev_int_collapsed
+      node_,
     );
 }
 #+END_SRC
@@ -1044,7 +1102,7 @@ auto biblio_entry_tags_jsonstr =  `{
   "id"                               : ""
 }`; // is: book, article, magazine, newspaper, blog, other
 
-**** DONE [#B] bookindex section (scroll & seg)                  :book:index:
+**** [#B] bookindex section (scroll & seg)                  :book:index:
 
 #+name: abs_post
 #+BEGIN_SRC d
@@ -1066,12 +1124,17 @@ debug(bookindex) {                         // bookindex
 }
 #+END_SRC
 
-**** DONE blurb section?
+**** blurb section?
 
 #+name: abs_post
 #+BEGIN_SRC d
 if (an_object["blurb_nugget"].length == 0) {
   writeln("no blurb");
+  node_["object"]["is"]                       = "heading";
+  node_["object"]["obj_cite_number"]          = "0";
+  node_["object"]["segment_anchor_tag"]       = "blurb";
+  node_["object"]["parent_obj_cite_number"]   = "1";
+  node_["object"]["parent_lev_markup_number"] = "0";
   the_blurb_section ~=
     set_abstract_object.contents_heading(
       "(skip) there is no Blurb section",   // nugget/object
@@ -1081,6 +1144,7 @@ if (an_object["blurb_nugget"].length == 0) {
       "B",              // lev
       1,                // lev_int_markup
       1,                // lev_int_collapsed
+      node_,
     );
 } else {
   writeln("blurb");
@@ -1092,7 +1156,7 @@ debug(blurb) {
 }
 #+END_SRC
 
-**** DONE [#B] toc, table of contents section (scroll & seg)       :contents:
+**** [#B] toc, table of contents section (scroll & seg)       :contents:
 
 #+name: abs_post
 #+BEGIN_SRC d
@@ -2202,7 +2266,7 @@ void _block_flag_line_empty_(
   ref ObjComposite[] the_document_body_section,
   ref string[][string][string] bookindex_unordered_hashes,
   ref int obj_cite_number,
-  ref string _node,
+  ref string[string][string] _node,
   ref long cntr,
   ref int[string] type,
   string[string] obj_cite_number_poem,
@@ -3346,7 +3410,12 @@ private:
 
 #+name: ao_emitters_obj_inline_markup_heading_numbering_segment_anchor_tags
 #+BEGIN_SRC d
-  static string _configured_auto_heading_numbering_and_segment_anchor_tags(string munge_, string[string] obj_, string[string][string] dochead_make_aa) {
+  static string _configured_auto_heading_numbering_and_segment_anchor_tags(
+    string munge_,
+    string[string] obj_,
+    string[string][string]
+    dochead_make_aa
+  ) {
     if (dochead_make_aa["make"]["num_top"].length > 0) {
       if (!(match(munge_, rgx.heading_anchor_tag))) {
         static __gshared uint heading_num_top_level=9;
@@ -3561,7 +3630,11 @@ struct ObjAttributes {
 
 #+name: ao_emitters_obj_attributes_public
 #+BEGIN_SRC d
-  string obj_attributes(string obj_is_, string obj_raw, string _node)
+  string obj_attributes(
+    string obj_is_,
+    string obj_raw,
+    string[string][string] _node
+  )
   in { }
   body {
     scope(exit) {
@@ -3813,24 +3886,26 @@ struct ObjAttributes {
 
 #+name: ao_emitters_obj_attributes_private_json
 #+BEGIN_SRC d
-  string _set_additional_values_parse_as_json(string _obj_attrib, string obj_is_, string _node) {
+  string _set_additional_values_parse_as_json(
+    string _obj_attrib,
+    string obj_is_,
+    string[string][string] _node
+  ) {                                                  //
     JSONValue oa_j = parseJSON(_obj_attrib);
-    JSONValue node_j = parseJSON(_node);
     assert(
-      (oa_j.type == JSON_TYPE.OBJECT) &&
-      (node_j.type == JSON_TYPE.OBJECT)
+      (oa_j.type == JSON_TYPE.OBJECT)
     );
     if (obj_is_ == "heading") {
-      oa_j.object["obj_cite_number"] = node_j["obj_cite_number"];
-      oa_j.object["lev_markup_number"] = node_j["lev_markup_number"];
-      oa_j.object["lev_collapsed_number"] = node_j["lev_collapsed_number"];
+      oa_j.object["obj_cite_number"] = _node["object"]["obj_cite_number"];
+      oa_j.object["lev_markup_number"] = _node["heading"]["lev_markup_number"];
+      oa_j.object["lev_collapsed_number"] = _node["heading"]["lev_collapsed_number"];
       oa_j.object["heading_ptr"] =
-        node_j["heading_ptr"]; // check
+        _node["object"]["heading_ptr"]; // check
       oa_j.object["doc_object_ptr"] =
-        node_j["doc_object_ptr"]; // check
+        _node["object"]["doc_object_ptr"]; // check
     }
-    oa_j.object["parent_obj_cite_number"] = node_j["parent_obj_cite_number"];
-    oa_j.object["parent_lev_markup_number"] = node_j["parent_lev_markup_number"];
+    oa_j.object["parent_obj_cite_number"] = _node["object"]["parent_obj_cite_number"];
+    oa_j.object["parent_lev_markup_number"] = _node["object"]["parent_lev_markup_number"];
     _obj_attrib = oa_j.toString();
     return _obj_attrib;
   }
@@ -3855,7 +3930,10 @@ struct BookIndexNuggetHash {
   string[][string][string] bi;
   string[][string][string] hash_nugget;
   string[] bi_main_terms_split_arr;
-  string[][string][string] bookindex_nugget_hash(string bookindex_section, int obj_cite_number)
+  string[][string][string] bookindex_nugget_hash(
+    string bookindex_section,
+    int obj_cite_number
+  )
   in {
     debug(bookindexraw) {
       if (!bookindex_section.empty) {
@@ -4005,6 +4083,7 @@ struct BookIndexReportSection {
     string                   segment_anchor_tag_that_object_belongs_to,
     bool[string]             opt_action_bool,
   ) {
+    mixin SiSUnode;
     string type;
     string lev;
     int lev_int_markup, lev_int_collapsed;
@@ -4014,6 +4093,7 @@ struct BookIndexReportSection {
     auto mainkeys =
       bookindex_unordered_hashes.byKey.array.sort().release;
     ObjComposite[][string] bookindex_section;
+    auto node_ = node_metadata;
     if ((mainkeys.length > 0)
     && (opt_action_bool["backmatter"] && opt_action_bool["section_bookindex"])) {
       string bi_tmp_seg, bi_tmp_scroll;
@@ -4021,6 +4101,11 @@ struct BookIndexReportSection {
       lev="B";
       lev_int_markup=1;
       lev_int_collapsed=1;
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "bookindex";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       bookindex_section["scroll"] ~=
         set_abstract_object.contents_heading(
           "Book Index",
@@ -4029,7 +4114,8 @@ struct BookIndexReportSection {
           [],
           to!string(lev),
           lev_int_markup,
-          lev_int_collapsed
+          lev_int_collapsed,
+          node_,
         );
       bookindex_section["seg"] ~=
         set_abstract_object.contents_heading(
@@ -4039,7 +4125,8 @@ struct BookIndexReportSection {
           [],
           to!string(lev),
           lev_int_markup,
-          lev_int_collapsed
+          lev_int_collapsed,
+          node_,
         );
       ++obj_cite_number;
       ++mkn;
@@ -4048,6 +4135,11 @@ struct BookIndexReportSection {
       lev="1";
       lev_int_markup=4;
       lev_int_collapsed=2;
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "bookindex";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       bookindex_section["scroll"] ~=
         set_abstract_object.contents_heading(
           "Index",
@@ -4056,7 +4148,8 @@ struct BookIndexReportSection {
           ["book_index"],
           to!string(lev),
           lev_int_markup,
-          lev_int_collapsed
+          lev_int_collapsed,
+          node_,
         );
       bookindex_section["seg"] ~=
         set_abstract_object.contents_heading(
@@ -4066,7 +4159,8 @@ struct BookIndexReportSection {
           ["book_index"],
           to!string(lev),
           lev_int_markup,
-          lev_int_collapsed
+          lev_int_collapsed,
+          node_,
         );
       ++obj_cite_number;
       ++mkn;
@@ -4129,6 +4223,11 @@ struct BookIndexReportSection {
         ++mkn;
       }
     } else {                              // no book index, (figure out what to do here)
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "bookindex";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       bookindex_section["scroll"] ~=
         set_abstract_object.contents_heading(
           "(skip) there is no Book Index",
@@ -4137,7 +4236,8 @@ struct BookIndexReportSection {
           [""],
           "B",
           1,
-          1
+          1,
+          node_,
         );
       bookindex_section["seg"] ~=
         set_abstract_object.contents_heading(
@@ -4147,7 +4247,8 @@ struct BookIndexReportSection {
           [""],
           "B",
           1,
-          1
+          1,
+          node_,
         );
     }
     auto t = tuple(bookindex_section, obj_cite_number);
@@ -4264,6 +4365,7 @@ struct NotesSection {
   in {
   }
   body {
+    mixin SiSUnode;
     auto set_abstract_object = ObjectAbstractSet();
     ObjComposite[][string] the_endnotes_section;
     auto endnotes_ = gathered_notes();
@@ -4271,12 +4373,18 @@ struct NotesSection {
     string lev, lev_markup_number, lev_collapsed_number;
     string attrib;
     int[string] indent;
+    auto node_ = node_metadata;
     if ((endnotes_["seg"].length > 0)
     && (opt_action_bool["backmatter"] && opt_action_bool["section_endnotes"])) {
       attrib="";
       lev="B";
       lev_markup_number="1";
       lev_collapsed_number="1";
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "endnotes";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_endnotes_section["seg"] ~=
         set_abstract_object.contents_heading(
           "Endnotes",
@@ -4285,7 +4393,8 @@ struct NotesSection {
           [],
           to!string(lev),
           to!int(lev_markup_number),
-          to!int(lev_collapsed_number)
+          to!int(lev_collapsed_number),
+          node_,
         );
       the_endnotes_section["scroll"] ~=
         set_abstract_object.contents_heading(
@@ -4295,7 +4404,8 @@ struct NotesSection {
           [],
           to!string(lev),
           to!int(lev_markup_number),
-          to!int(lev_collapsed_number)
+          to!int(lev_collapsed_number),
+          node_,
         );
       ++obj_cite_number;
       ++mkn;
@@ -4303,6 +4413,11 @@ struct NotesSection {
       lev="1";
       lev_markup_number="4";
       lev_collapsed_number="2";
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "endnotes";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_endnotes_section["seg"] ~=
         set_abstract_object.contents_heading(
           "Endnotes",
@@ -4311,7 +4426,8 @@ struct NotesSection {
           ["endnotes"],
           to!string(lev),
           to!int(lev_markup_number),
-          to!int(lev_collapsed_number)
+          to!int(lev_collapsed_number),
+          node_,
         );
       the_endnotes_section["scroll"] ~=
         set_abstract_object.contents_heading(
@@ -4321,11 +4437,17 @@ struct NotesSection {
           ["endnotes"],
           to!string(lev),
           to!int(lev_markup_number),
-          to!int(lev_collapsed_number)
+          to!int(lev_collapsed_number),
+          node_,
         );
       ++obj_cite_number;
       ++mkn;
     } else {
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "endnotes";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       the_endnotes_section["seg"] ~=
         set_abstract_object.contents_heading(
           "(skip) there are no Endnotes",
@@ -4334,7 +4456,8 @@ struct NotesSection {
           [""],
           "B",
           1,
-          1
+          1,
+          node_,
         );
       the_endnotes_section["scroll"] ~=
         set_abstract_object.contents_heading(
@@ -4344,7 +4467,8 @@ struct NotesSection {
           [""],
           "B",
           1,
-          1
+          1,
+          node_,
         );
     }
     if (opt_action_bool["backmatter"] && opt_action_bool["section_endnotes"]) {
@@ -4497,14 +4621,14 @@ struct NodeStructureMetadata {
   int lv, lv0, lv1, lv2, lv3, lv4, lv5, lv6, lv7;
   int obj_cite_number;
   int[string] p_; // p_ parent_
-  string _node;
+  string[string][string] _node;
 #+END_SRC
 
-**** TODO metadata node emitter
+**** TODO node metadata emitter
 
 #+name: ao_emitters_metadata
 #+BEGIN_SRC d
-  string node_emitter(
+  string[string][string] node_emitter(
     string lev_markup_number,
     string segment_anchor_tag,
     int    obj_cite_number_,
@@ -4534,16 +4658,24 @@ struct NodeStructureMetadata {
       p_["lev_markup_number"] = DocStructMarkupHeading.h_text_1;
       p_["obj_cite_number"] = lv4;
     }
-    _node=("{ " ~
-      "\"is\": \""                       ~ is_ ~ "\"" ~
-      ", \"heading_ptr\": "          ~ to!string(ptr_) ~
-      ", \"doc_object_ptr\": "       ~ to!string(cntr_) ~
-      ", \"obj_cite_number\": "          ~ to!string(obj_cite_number_) ~
-      ", \"segment_anchor_tag\": \""     ~ segment_anchor_tag ~ "\"" ~
-      ", \"parent_obj_cite_number\": "   ~ to!string(p_["obj_cite_number"]) ~
-      ", \"parent_lev_markup_number\": " ~ to!string(p_["lev_markup_number"]) ~
-      " }"
-    );
+    auto _node = [
+      "object" : [
+        "is"                         : is_,
+        "heading_ptr"                : to!string(ptr_),
+        "doc_object_ptr"             : to!string(cntr_),
+        "obj_cite_number"            : to!string(obj_cite_number_),
+        "segment_anchor_tag"         : to!string(segment_anchor_tag),
+        "parent_obj_cite_number"     : to!string(p_["obj_cite_number"]),
+        "parent_lev_markup_number"   : to!string(p_["lev_markup_number"]),
+      ],
+      "heading" : [
+        "html_segnames_ptr"          : "",
+        "lev_markup_number"          : "",
+        "lev_collapsed_number"       : "",
+        // "ancestors"                  : "",
+        // "open_headings_to_close"     : "",
+      ]
+    ];
     debug(node) {
       if (match(lev_markup_number, rgx.levels_numbered_headings)) {
         writeln("x ", to!string(_node));
@@ -4551,21 +4683,20 @@ struct NodeStructureMetadata {
         writeln("- ", to!string(_node));
       }
     }
-    JSONValue j = parseJSON(_node);
-    assert(j["parent_lev_markup_number"].integer >= 4);
-    assert(j["parent_lev_markup_number"].integer <= 7);
-    assert(j["parent_obj_cite_number"].integer >= 0);
+    assert(to!int(_node["object"]["parent_lev_markup_number"]) >= 4);
+    assert(to!int(_node["object"]["parent_lev_markup_number"]) <= 7);
+    assert(to!int(_node["object"]["parent_obj_cite_number"]) >= 0);      // hmm, perhaps
     return _node;
   }
   invariant() {
   }
 #+END_SRC
 
-**** TODO metadata emitter heading
+**** TODO node metadata emitter heading
 
 #+name: ao_emitters_metadata
 #+BEGIN_SRC d
-  string node_emitter_heading(
+  string[string][string] node_emitter_heading(
     string lev_markup_number,
     string lev_collapsed_number,
     string segment_anchor_tag,
@@ -4672,20 +4803,25 @@ struct NodeStructureMetadata {
     default:
       break;
     }
-    _node=("{ " ~
-      "\"is\": \""                             ~ is_ ~ "\"" ~
-      ", \"heading_ptr\": "                ~ to!string(ptr_) ~
-      ", \"doc_object_ptr\": "             ~ to!string(cntr_) ~
-      ", \"html_segnames_ptr\": \""        ~ ((lev_markup_number == "4") ? (to!string(html_segnames_ptr)) : "") ~ "\"" ~
-      ", \"obj_cite_number\": "                ~ to!string(obj_cite_number_) ~
-      ", \"lev_markup_number\": "              ~ to!string(lev_markup_number) ~
-      ", \"lev_collapsed_number\": "           ~ to!string(lev_collapsed_number) ~
-      ", \"segment_anchor_tag\": \""           ~ segment_anchor_tag ~ "\"" ~
-      ", \"parent_obj_cite_number\": "         ~ to!string(p_["obj_cite_number"]) ~
-      ", \"parent_lev_markup_number\": "       ~ to!string(p_["lev_markup_number"]) ~
-      " }"
-    );
-    debug(heading) {
+    auto _node = [
+      "object" : [
+        "is"                         : is_,
+        "heading_ptr"                : to!string(ptr_),
+        "doc_object_ptr"             : to!string(cntr_),
+        "obj_cite_number"            : to!string(obj_cite_number_),
+        "segment_anchor_tag"         : to!string(segment_anchor_tag),
+        "parent_obj_cite_number"     : to!string(p_["obj_cite_number"]),
+        "parent_lev_markup_number"   : to!string(p_["lev_markup_number"]),
+      ],
+      "heading" : [
+        "html_segnames_ptr"          : ((lev_markup_number == "4") ? (to!string(html_segnames_ptr)) : ""),
+        "lev_markup_number"          : to!string(lev_markup_number),
+        "lev_collapsed_number"       : to!string(lev_collapsed_number),
+        // "ancestors"                  : to!string(ancestors),
+        // "open_headings_to_close"     : to!string(open_headings_to_close),
+      ]
+    ];
+    debug(node) {
       if (match(lev_markup_number, rgx.levels_numbered_headings)) {
         writeln("* ", to!string(_node));
       }
@@ -4695,35 +4831,34 @@ struct NodeStructureMetadata {
         writeln("* ", to!string(_node));
       }
     }
-    JSONValue j = parseJSON(_node);
-    assert(j["parent_lev_markup_number"].integer <= 7);
-    assert(j["parent_obj_cite_number"].integer >= 0);
+    assert(to!int(_node["object"]["parent_lev_markup_number"]) <= 7);
+    assert(to!int(_node["object"]["parent_obj_cite_number"]) >= 0);
     if (match(lev_markup_number, rgx.levels_numbered_headings)) {
-      assert(j["lev_markup_number"].integer <= 7);
-      assert(j["obj_cite_number"].integer >= 0);
-      if (j["parent_lev_markup_number"].integer > 0) {
-        assert(j["parent_lev_markup_number"].integer < j["lev_markup_number"].integer);
-        if (j["obj_cite_number"].integer != 0) {
-          assert(j["parent_obj_cite_number"].integer < j["obj_cite_number"].integer);
+      assert(to!int(_node["heading"]["lev_markup_number"]) <= 7);
+      assert(to!int(_node["object"]["obj_cite_number"]) >= 0);
+      if (to!int(_node["object"]["parent_lev_markup_number"]) > 0) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) < to!int(_node["heading"]["lev_markup_number"]));
+        if (to!int(_node["object"]["obj_cite_number"]) != 0) {
+          assert(to!int(_node["object"]["parent_obj_cite_number"]) < to!int(_node["object"]["obj_cite_number"]));
         }
       }
-      if (j["lev_markup_number"].integer == 0) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_A);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_B) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_A);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_C) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_B);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_D) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_C);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_1) {
-        assert(j["parent_lev_markup_number"].integer <= DocStructMarkupHeading.h_sect_D);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_2) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_1);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_3) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_2);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_4) {
-        assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_3);
-      } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_5) {
+      if (to!int(_node["heading"]["lev_markup_number"]) == 0) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_A);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_B) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_A);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_C) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_B);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_D) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_C);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_1) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) <= DocStructMarkupHeading.h_sect_D);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_2) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_1);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_3) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_2);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_4) {
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_3);
+      } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_5) {
       }
     }
     return _node;
@@ -4744,7 +4879,10 @@ struct NodeStructureMetadata {
 
 #+name: abs_functions_assertions
 #+BEGIN_SRC d
-auto assertions_doc_structure(string[string] an_object, int[string] lv) {
+auto assertions_doc_structure(
+  string[string] an_object,
+  int[string] lv
+) {
   if (lv["h3"] > State.off) {
     assert(lv["h0"] > State.off);
     assert(lv["h1"] > State.off);
@@ -5016,7 +5154,7 @@ struct Node {
 // heading segments, 1~ lev4:
   int heading_array_ptr_segments = 0; // TODO
 // node info json string:
-  string node                        = "";
+  string[string][string] node;
 }
 #+END_SRC
 
@@ -5074,6 +5212,7 @@ auto contents_heading(
   in string lev,
   in int lev_int_markup,
   in int lev_int_collapsed,
+  in string[string][string] _node,
 ) {
   ObjComposite object_set;
   object_set.use                                 = "content";
@@ -5216,7 +5355,7 @@ auto contents_block_obj_cite_number_string(
   in string type,
   in string object,
   in string obj_cite_number,
-  in string _node
+  in string[string][string] _node
 ) {
   ObjComposite object_set;
   object_set.use                               = "content";
diff --git a/org/ao_defaults.org b/org/ao_defaults.org
index 067fe59..4f9777c 100644
--- a/org/ao_defaults.org
+++ b/org/ao_defaults.org
@@ -169,7 +169,7 @@ template SiSUregisters() {
 
 #+name: ao_defaults_templates
 #+BEGIN_SRC d
-  auto pointer_head_main =
+  auto ptr_head_main =
     [
       "classify",
       "creator",
@@ -182,7 +182,7 @@ template SiSUregisters() {
       "rights",
       "title"
     ];
-  auto pointer_head_sub_classify =
+  auto ptr_head_sub_classify =
     [
       "dewey",
       "keywords",
@@ -190,7 +190,7 @@ template SiSUregisters() {
       "subject",
       "topic_register"
     ];
-  auto pointer_head_sub_creator =
+  auto ptr_head_sub_creator =
     [
       "author",
       "author_email",
@@ -198,7 +198,7 @@ template SiSUregisters() {
       "illustrator",
       "translator"
     ];
-  auto pointer_head_sub_date =
+  auto ptr_head_sub_date =
     [
       "added_to_site",
       "available",
@@ -208,14 +208,14 @@ template SiSUregisters() {
       "published",
       "valid"
     ];
-  auto pointer_head_sub_identifier =
+  auto ptr_head_sub_identifier =
     [
       "isbn",
       "oclc",
       "pg"
     ];
   /+ make +/
-  auto pointer_head_sub_make =
+  auto ptr_head_sub_make =
     [
       "cover_image",
       "home_button_image",
@@ -230,27 +230,27 @@ template SiSUregisters() {
       "texpdf_font",
       "css"
     ];
-  auto pointer_head_sub_notes =
+  auto ptr_head_sub_notes =
     [
       "abstract",
       "description"
     ];
-  auto pointer_head_sub_original =
+  auto ptr_head_sub_original =
     [
       "language",
       "source",
       "title"
     ];
-  auto pointer_head_sub_publisher =
+  auto ptr_head_sub_publisher =
     [ "name" ];
-  auto pointer_head_sub_rights =
+  auto ptr_head_sub_rights =
     [
       "copyright",
       "cover",
       "illustrations",
       "license"
     ];
-  auto pointer_head_sub_title =
+  auto ptr_head_sub_title =
     [
       "edition",
       "full",
@@ -389,6 +389,33 @@ template SiSUrgxInitFlags() {
 }
 #+END_SRC
 
+#+name: ao_defaults_templates
+#+BEGIN_SRC d
+template SiSUnode() {
+  string[string][string] node_metadata() {
+    auto node_ = [
+      "object" : [
+        "is"                         : "",
+        "heading_ptr"                : "",
+        "doc_object_ptr"             : "",
+        "obj_cite_number"            : "",
+        "segment_anchor_tag"         : "",
+        "parent_obj_cite_number"     : "",
+        "parent_lev_markup_number"   : "",
+      ],
+      "heading" : [
+        "html_segnames_ptr"          : "",
+        "lev_markup_number"          : "",
+        "lev_collapsed_number"       : "",
+      //   "ancestors"                  : "",
+      //   "open_headings_to_close"     : "",
+      ],
+    ];
+    return node_;
+  }
+}
+#+END_SRC
+
 ** template: bibliography                                            :biblio:
 
 #+name: ao_defaults_templates
diff --git a/org/sdp.org b/org/sdp.org
index a8e8724..6a2c0b7 100644
--- a/org/sdp.org
+++ b/org/sdp.org
@@ -150,6 +150,7 @@ mixin RgxInit;
 mixin SiSUregisters;
 mixin SiSUheaderExtractHub;
 mixin SiSUheaderExtractSDLang;
+mixin SiSUnode;
 mixin SiSUbiblio;
 mixin SiSUrgxInitFlags;
 mixin SiSUconfigSDLangHub;
diff --git a/src/sdp.d b/src/sdp.d
index 8b376e6..a900b55 100755
--- a/src/sdp.d
+++ b/src/sdp.d
@@ -45,6 +45,7 @@ void main(string[] args) {
   mixin SiSUregisters;
   mixin SiSUheaderExtractHub;
   mixin SiSUheaderExtractSDLang;
+  mixin SiSUnode;
   mixin SiSUbiblio;
   mixin SiSUrgxInitFlags;
   mixin SiSUconfigSDLangHub;
diff --git a/src/sdp/ao_abstract_doc_source.d b/src/sdp/ao_abstract_doc_source.d
index 7dbc573..c2cf32b 100644
--- a/src/sdp/ao_abstract_doc_source.d
+++ b/src/sdp/ao_abstract_doc_source.d
@@ -70,11 +70,14 @@ template SiSUdocAbstraction() {
     string book_idx_tmp;
     string[][string][string] bookindex_unordered_hashes;
     auto bookindex_extract_hash = BookIndexNuggetHash();
-    string[][string][string] bkidx_hash(string bookindex_section, int obj_cite_number) {
+    string[][string][string] bkidx_hash(
+      string bookindex_section,
+      int obj_cite_number
+    ) {
       return bookindex_extract_hash.bookindex_nugget_hash(bookindex_section, obj_cite_number);
     }
     /+ node +/
-    string _node;
+    string[string][string] _node;
     auto node_construct = NodeStructureMetadata();
     /+ ↓ abstract marked up document +/
     auto abstract_doc_source(
@@ -97,6 +100,7 @@ template SiSUdocAbstraction() {
         destroy(processing);
         destroy(biblio_arr_json);
       }
+      auto node_ = node_metadata;
       line_occur = [
         "heading"  : 0,
         "para"     : 0,
@@ -104,13 +108,6 @@ template SiSUdocAbstraction() {
         "blurb"    : 0,
       ];
       auto type = flags_type_init;
-      void tell_lo(int obj_cite_number, in char[] line) {
-        writefln(
-          "* %s %s",
-          to!string(obj_cite_number),
-          to!string(line)
-        );
-      }
       string[string] obj_cite_number_poem = [
         "start" : "",
         "end"   : ""
@@ -161,6 +158,11 @@ template SiSUdocAbstraction() {
       string toc_txt_;
       an_object["glossary_nugget"] = "";
       an_object["blurb_nugget"] = "";
+      node_["object"]["is"]                       = "heading";
+      node_["object"]["obj_cite_number"]          = "0";
+      node_["object"]["segment_anchor_tag"]       = "toc";
+      node_["object"]["parent_obj_cite_number"]   = "1";
+      node_["object"]["parent_lev_markup_number"] = "0";
       auto toc_head =
         set_abstract_object.contents_heading(
           "Table of Contents", // nugget/object
@@ -170,6 +172,7 @@ template SiSUdocAbstraction() {
           "1",                 // lev
           4,                   // lev_int_markup
           2,                   // lev_int_collapsed
+          node_,
         );
       the_table_of_contents_section = [
         "seg": [toc_head],
@@ -258,6 +261,11 @@ template SiSUdocAbstraction() {
               line_occur["para"] = State.off;
               an_object_key="glossary_nugget"; //
               if (matchFirst(line, rgx.heading_glossary)) {
+                node_["object"]["is"]                       = "heading";
+                node_["object"]["obj_cite_number"]          = "0";
+                node_["object"]["segment_anchor_tag"]       = "glossary";
+                node_["object"]["parent_obj_cite_number"]   = "1";
+                node_["object"]["parent_lev_markup_number"] = "0";
                 the_glossary_section ~=
                   set_abstract_object.contents_heading(
                     "Glossary",       // nugget/object
@@ -267,7 +275,13 @@ template SiSUdocAbstraction() {
                     "B",              // lev
                     1,                // lev_int_markup
                     1,                // lev_int_collapsed
+                    node_,
                   );
+                node_["object"]["is"]                       = "heading";
+                node_["object"]["obj_cite_number"]          = "0";
+                node_["object"]["segment_anchor_tag"]       = "glossary";
+                node_["object"]["parent_obj_cite_number"]   = "1";
+                node_["object"]["parent_lev_markup_number"] = "0";
                 the_glossary_section ~=
                   set_abstract_object.contents_heading(
                     "Glossary",       // nugget/object
@@ -277,6 +291,7 @@ template SiSUdocAbstraction() {
                     "1",              // lev
                     4,                // lev_int_markup
                     2,                // lev_int_collapsed
+                    node_,
                   );
               // } else if (matchFirst(line, rgx.heading)) {
               //   _heading_matched_(line, line_occur, an_object, an_object_key, lv, collapsed_lev, type, dochead_meta_aa); // levels?
@@ -319,6 +334,11 @@ template SiSUdocAbstraction() {
               line_occur["para"] = State.off;
               an_object_key="blurb_nugget";
               if (matchFirst(line, rgx.heading_blurb)) {
+                node_["object"]["is"]                       = "heading";
+                node_["object"]["obj_cite_number"]          = "0";
+                node_["object"]["segment_anchor_tag"]       = "blurb";
+                node_["object"]["parent_obj_cite_number"]   = "1";
+                node_["object"]["parent_lev_markup_number"] = "0";
                 the_blurb_section ~=
                   set_abstract_object.contents_heading(
                     "Blurb",          // nugget/object
@@ -328,7 +348,13 @@ template SiSUdocAbstraction() {
                     "B",              // lev
                     1,                // lev_int_markup
                     1,                // lev_int_collapsed
+                    node_,
                   );
+                node_["object"]["is"]                       = "heading";
+                node_["object"]["obj_cite_number"]          = "0";
+                node_["object"]["segment_anchor_tag"]       = "blurb";
+                node_["object"]["parent_obj_cite_number"]   = "1";
+                node_["object"]["parent_lev_markup_number"] = "0";
                 the_blurb_section ~=
                   set_abstract_object.contents_heading(
                     "Blurb",          // nugget/object
@@ -338,10 +364,16 @@ template SiSUdocAbstraction() {
                     "1",              // lev
                     4,                // lev_int_markup
                     2,                // lev_int_collapsed
+                    node_,
                   );
               } else if ((matchFirst(line, rgx.heading))
-                && (opt_action_bool["backmatter"] && opt_action_bool["section_blurb"])) {
+              && (opt_action_bool["backmatter"] && opt_action_bool["section_blurb"])) {
                 _heading_matched_(line, line_occur, an_object, an_object_key, lv, collapsed_lev, type, dochead_meta_aa); // levels?
+                node_["object"]["is"]                       = "heading";
+                node_["object"]["obj_cite_number"]          = "0";
+                node_["object"]["segment_anchor_tag"]       = "blurb";
+                node_["object"]["parent_obj_cite_number"]   = "1";
+                node_["object"]["parent_lev_markup_number"] = "0";
                 the_blurb_section ~=
                   set_abstract_object.contents_heading(
                     to!string(line),           //  an_object["substantive"],
@@ -351,6 +383,7 @@ template SiSUdocAbstraction() {
                     to!string(an_object["lev"]),
                     to!int(an_object["lev_markup_number"]),
                     to!int(an_object["lev_collapsed_number"]),
+                    node_,
                   );
               } else {
                 _para_match_(line, an_object, an_object_key, indent, bullet, type, line_occur);
@@ -581,6 +614,7 @@ template SiSUdocAbstraction() {
                     to!string(an_object["lev"]),
                     to!int(an_object["lev_markup_number"]),
                     to!int(an_object["lev_collapsed_number"]),
+                    _node,
                   );
                 // track previous heading and make assertions
                 debug(objectrelated1) { // check
@@ -700,6 +734,11 @@ template SiSUdocAbstraction() {
       }
       if (an_object["glossary_nugget"].length == 0) {
         writeln("no gloss");
+        node_["object"]["is"]                       = "heading";
+        node_["object"]["obj_cite_number"]          = "0";
+        node_["object"]["segment_anchor_tag"]       = "glossary";
+        node_["object"]["parent_obj_cite_number"]   = "1";
+        node_["object"]["parent_lev_markup_number"] = "0";
         the_glossary_section ~=
           set_abstract_object.contents_heading(
             "(skip) there is no Glossary section",   // nugget/object
@@ -709,6 +748,7 @@ template SiSUdocAbstraction() {
             "B",              // lev
             1,                // lev_int_markup
             1,                // lev_int_collapsed
+            node_,
           );
       } else {
         writeln("gloss");
@@ -724,6 +764,11 @@ template SiSUdocAbstraction() {
       auto biblio_ordered =
         biblio._bibliography_(biblio_unsorted_incomplete, bib_arr_json);
       if (biblio_ordered.length > 0) {
+        node_["object"]["is"]                       = "heading";
+        node_["object"]["obj_cite_number"]          = "0";
+        node_["object"]["segment_anchor_tag"]       = "bibliography";
+        node_["object"]["parent_obj_cite_number"]   = "1";
+        node_["object"]["parent_lev_markup_number"] = "0";
         the_bibliography_section ~=
           set_abstract_object.contents_heading(
             "Bibliography",   // nugget/object
@@ -733,7 +778,13 @@ template SiSUdocAbstraction() {
             "B",              // lev
             1,                // lev_int_markup
             1,                // lev_int_collapsed
+            node_,
           );
+        node_["object"]["is"]                       = "heading";
+        node_["object"]["obj_cite_number"]          = "0";
+        node_["object"]["segment_anchor_tag"]       = "bibliography";
+        node_["object"]["parent_obj_cite_number"]   = "1";
+        node_["object"]["parent_lev_markup_number"] = "0";
         the_bibliography_section ~=
           set_abstract_object.contents_heading(
             "Bibliography",   // nugget/object
@@ -743,8 +794,14 @@ template SiSUdocAbstraction() {
             "1",              // lev
             4,                // lev_int_markup
             2,                // lev_int_collapsed
+            node_,
           );
       } else {
+        node_["object"]["is"]                       = "heading";
+        node_["object"]["obj_cite_number"]          = "0";
+        node_["object"]["segment_anchor_tag"]       = "bibliography";
+        node_["object"]["parent_obj_cite_number"]   = "1";
+        node_["object"]["parent_lev_markup_number"] = "0";
         the_bibliography_section ~=
           set_abstract_object.contents_heading(
             "(skip) there is no Bibliography",   // nugget/object
@@ -754,6 +811,7 @@ template SiSUdocAbstraction() {
             "B",              // lev
             1,                // lev_int_markup
             1,                // lev_int_collapsed
+            node_,
           );
       }
       string out_;
@@ -805,6 +863,11 @@ template SiSUdocAbstraction() {
       }
       if (an_object["blurb_nugget"].length == 0) {
         writeln("no blurb");
+        node_["object"]["is"]                       = "heading";
+        node_["object"]["obj_cite_number"]          = "0";
+        node_["object"]["segment_anchor_tag"]       = "blurb";
+        node_["object"]["parent_obj_cite_number"]   = "1";
+        node_["object"]["parent_lev_markup_number"] = "0";
         the_blurb_section ~=
           set_abstract_object.contents_heading(
             "(skip) there is no Blurb section",   // nugget/object
@@ -814,6 +877,7 @@ template SiSUdocAbstraction() {
             "B",              // lev
             1,                // lev_int_markup
             1,                // lev_int_collapsed
+            node_,
           );
       } else {
         writeln("blurb");
@@ -1747,7 +1811,7 @@ template SiSUdocAbstraction() {
       ref ObjComposite[] the_document_body_section,
       ref string[][string][string] bookindex_unordered_hashes,
       ref int obj_cite_number,
-      ref string _node,
+      ref string[string][string] _node,
       ref long cntr,
       ref int[string] type,
       string[string] obj_cite_number_poem,
@@ -2817,7 +2881,12 @@ template SiSUdocAbstraction() {
       invariant() {
       }
     private:
-      static string _configured_auto_heading_numbering_and_segment_anchor_tags(string munge_, string[string] obj_, string[string][string] dochead_make_aa) {
+      static string _configured_auto_heading_numbering_and_segment_anchor_tags(
+        string munge_,
+        string[string] obj_,
+        string[string][string]
+        dochead_make_aa
+      ) {
         if (dochead_make_aa["make"]["num_top"].length > 0) {
           if (!(match(munge_, rgx.heading_anchor_tag))) {
             static __gshared uint heading_num_top_level=9;
@@ -2996,7 +3065,11 @@ template SiSUdocAbstraction() {
     }
     struct ObjAttributes {
       string[string] _obj_attrib;
-      string obj_attributes(string obj_is_, string obj_raw, string _node)
+      string obj_attributes(
+        string obj_is_,
+        string obj_raw,
+        string[string][string] _node
+      )
       in { }
       body {
         scope(exit) {
@@ -3175,24 +3248,26 @@ template SiSUdocAbstraction() {
       }
       invariant() {
       }
-      string _set_additional_values_parse_as_json(string _obj_attrib, string obj_is_, string _node) {
+      string _set_additional_values_parse_as_json(
+        string _obj_attrib,
+        string obj_is_,
+        string[string][string] _node
+      ) {                                                  //
         JSONValue oa_j = parseJSON(_obj_attrib);
-        JSONValue node_j = parseJSON(_node);
         assert(
-          (oa_j.type == JSON_TYPE.OBJECT) &&
-          (node_j.type == JSON_TYPE.OBJECT)
+          (oa_j.type == JSON_TYPE.OBJECT)
         );
         if (obj_is_ == "heading") {
-          oa_j.object["obj_cite_number"] = node_j["obj_cite_number"];
-          oa_j.object["lev_markup_number"] = node_j["lev_markup_number"];
-          oa_j.object["lev_collapsed_number"] = node_j["lev_collapsed_number"];
+          oa_j.object["obj_cite_number"] = _node["object"]["obj_cite_number"];
+          oa_j.object["lev_markup_number"] = _node["heading"]["lev_markup_number"];
+          oa_j.object["lev_collapsed_number"] = _node["heading"]["lev_collapsed_number"];
           oa_j.object["heading_ptr"] =
-            node_j["heading_ptr"]; // check
+            _node["object"]["heading_ptr"]; // check
           oa_j.object["doc_object_ptr"] =
-            node_j["doc_object_ptr"]; // check
+            _node["object"]["doc_object_ptr"]; // check
         }
-        oa_j.object["parent_obj_cite_number"] = node_j["parent_obj_cite_number"];
-        oa_j.object["parent_lev_markup_number"] = node_j["parent_lev_markup_number"];
+        oa_j.object["parent_obj_cite_number"] = _node["object"]["parent_obj_cite_number"];
+        oa_j.object["parent_lev_markup_number"] = _node["object"]["parent_lev_markup_number"];
         _obj_attrib = oa_j.toString();
         return _obj_attrib;
       }
@@ -3204,7 +3279,10 @@ template SiSUdocAbstraction() {
       string[][string][string] bi;
       string[][string][string] hash_nugget;
       string[] bi_main_terms_split_arr;
-      string[][string][string] bookindex_nugget_hash(string bookindex_section, int obj_cite_number)
+      string[][string][string] bookindex_nugget_hash(
+        string bookindex_section,
+        int obj_cite_number
+      )
       in {
         debug(bookindexraw) {
           if (!bookindex_section.empty) {
@@ -3329,6 +3407,7 @@ template SiSUdocAbstraction() {
         string                   segment_anchor_tag_that_object_belongs_to,
         bool[string]             opt_action_bool,
       ) {
+        mixin SiSUnode;
         string type;
         string lev;
         int lev_int_markup, lev_int_collapsed;
@@ -3338,6 +3417,7 @@ template SiSUdocAbstraction() {
         auto mainkeys =
           bookindex_unordered_hashes.byKey.array.sort().release;
         ObjComposite[][string] bookindex_section;
+        auto node_ = node_metadata;
         if ((mainkeys.length > 0)
         && (opt_action_bool["backmatter"] && opt_action_bool["section_bookindex"])) {
           string bi_tmp_seg, bi_tmp_scroll;
@@ -3345,6 +3425,11 @@ template SiSUdocAbstraction() {
           lev="B";
           lev_int_markup=1;
           lev_int_collapsed=1;
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "bookindex";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           bookindex_section["scroll"] ~=
             set_abstract_object.contents_heading(
               "Book Index",
@@ -3353,7 +3438,8 @@ template SiSUdocAbstraction() {
               [],
               to!string(lev),
               lev_int_markup,
-              lev_int_collapsed
+              lev_int_collapsed,
+              node_,
             );
           bookindex_section["seg"] ~=
             set_abstract_object.contents_heading(
@@ -3363,7 +3449,8 @@ template SiSUdocAbstraction() {
               [],
               to!string(lev),
               lev_int_markup,
-              lev_int_collapsed
+              lev_int_collapsed,
+              node_,
             );
           ++obj_cite_number;
           ++mkn;
@@ -3372,6 +3459,11 @@ template SiSUdocAbstraction() {
           lev="1";
           lev_int_markup=4;
           lev_int_collapsed=2;
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "bookindex";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           bookindex_section["scroll"] ~=
             set_abstract_object.contents_heading(
               "Index",
@@ -3380,7 +3472,8 @@ template SiSUdocAbstraction() {
               ["book_index"],
               to!string(lev),
               lev_int_markup,
-              lev_int_collapsed
+              lev_int_collapsed,
+              node_,
             );
           bookindex_section["seg"] ~=
             set_abstract_object.contents_heading(
@@ -3390,7 +3483,8 @@ template SiSUdocAbstraction() {
               ["book_index"],
               to!string(lev),
               lev_int_markup,
-              lev_int_collapsed
+              lev_int_collapsed,
+              node_,
             );
           ++obj_cite_number;
           ++mkn;
@@ -3453,6 +3547,11 @@ template SiSUdocAbstraction() {
             ++mkn;
           }
         } else {                              // no book index, (figure out what to do here)
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "bookindex";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           bookindex_section["scroll"] ~=
             set_abstract_object.contents_heading(
               "(skip) there is no Book Index",
@@ -3461,7 +3560,8 @@ template SiSUdocAbstraction() {
               [""],
               "B",
               1,
-              1
+              1,
+              node_,
             );
           bookindex_section["seg"] ~=
             set_abstract_object.contents_heading(
@@ -3471,7 +3571,8 @@ template SiSUdocAbstraction() {
               [""],
               "B",
               1,
-              1
+              1,
+              node_,
             );
         }
         auto t = tuple(bookindex_section, obj_cite_number);
@@ -3558,6 +3659,7 @@ template SiSUdocAbstraction() {
       in {
       }
       body {
+        mixin SiSUnode;
         auto set_abstract_object = ObjectAbstractSet();
         ObjComposite[][string] the_endnotes_section;
         auto endnotes_ = gathered_notes();
@@ -3565,12 +3667,18 @@ template SiSUdocAbstraction() {
         string lev, lev_markup_number, lev_collapsed_number;
         string attrib;
         int[string] indent;
+        auto node_ = node_metadata;
         if ((endnotes_["seg"].length > 0)
         && (opt_action_bool["backmatter"] && opt_action_bool["section_endnotes"])) {
           attrib="";
           lev="B";
           lev_markup_number="1";
           lev_collapsed_number="1";
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "endnotes";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           the_endnotes_section["seg"] ~=
             set_abstract_object.contents_heading(
               "Endnotes",
@@ -3579,7 +3687,8 @@ template SiSUdocAbstraction() {
               [],
               to!string(lev),
               to!int(lev_markup_number),
-              to!int(lev_collapsed_number)
+              to!int(lev_collapsed_number),
+              node_,
             );
           the_endnotes_section["scroll"] ~=
             set_abstract_object.contents_heading(
@@ -3589,7 +3698,8 @@ template SiSUdocAbstraction() {
               [],
               to!string(lev),
               to!int(lev_markup_number),
-              to!int(lev_collapsed_number)
+              to!int(lev_collapsed_number),
+              node_,
             );
           ++obj_cite_number;
           ++mkn;
@@ -3597,6 +3707,11 @@ template SiSUdocAbstraction() {
           lev="1";
           lev_markup_number="4";
           lev_collapsed_number="2";
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "endnotes";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           the_endnotes_section["seg"] ~=
             set_abstract_object.contents_heading(
               "Endnotes",
@@ -3605,7 +3720,8 @@ template SiSUdocAbstraction() {
               ["endnotes"],
               to!string(lev),
               to!int(lev_markup_number),
-              to!int(lev_collapsed_number)
+              to!int(lev_collapsed_number),
+              node_,
             );
           the_endnotes_section["scroll"] ~=
             set_abstract_object.contents_heading(
@@ -3615,11 +3731,17 @@ template SiSUdocAbstraction() {
               ["endnotes"],
               to!string(lev),
               to!int(lev_markup_number),
-              to!int(lev_collapsed_number)
+              to!int(lev_collapsed_number),
+              node_,
             );
           ++obj_cite_number;
           ++mkn;
         } else {
+          node_["object"]["is"]                       = "heading";
+          node_["object"]["obj_cite_number"]          = "0";
+          node_["object"]["segment_anchor_tag"]       = "endnotes";
+          node_["object"]["parent_obj_cite_number"]   = "1";
+          node_["object"]["parent_lev_markup_number"] = "0";
           the_endnotes_section["seg"] ~=
             set_abstract_object.contents_heading(
               "(skip) there are no Endnotes",
@@ -3628,7 +3750,8 @@ template SiSUdocAbstraction() {
               [""],
               "B",
               1,
-              1
+              1,
+              node_,
             );
           the_endnotes_section["scroll"] ~=
             set_abstract_object.contents_heading(
@@ -3638,7 +3761,8 @@ template SiSUdocAbstraction() {
               [""],
               "B",
               1,
-              1
+              1,
+              node_,
             );
         }
         if (opt_action_bool["backmatter"] && opt_action_bool["section_endnotes"]) {
@@ -3741,8 +3865,8 @@ template SiSUdocAbstraction() {
       int lv, lv0, lv1, lv2, lv3, lv4, lv5, lv6, lv7;
       int obj_cite_number;
       int[string] p_; // p_ parent_
-      string _node;
-      string node_emitter(
+      string[string][string] _node;
+      string[string][string] node_emitter(
         string lev_markup_number,
         string segment_anchor_tag,
         int    obj_cite_number_,
@@ -3772,16 +3896,24 @@ template SiSUdocAbstraction() {
           p_["lev_markup_number"] = DocStructMarkupHeading.h_text_1;
           p_["obj_cite_number"] = lv4;
         }
-        _node=("{ " ~
-          "\"is\": \""                       ~ is_ ~ "\"" ~
-          ", \"heading_ptr\": "          ~ to!string(ptr_) ~
-          ", \"doc_object_ptr\": "       ~ to!string(cntr_) ~
-          ", \"obj_cite_number\": "          ~ to!string(obj_cite_number_) ~
-          ", \"segment_anchor_tag\": \""     ~ segment_anchor_tag ~ "\"" ~
-          ", \"parent_obj_cite_number\": "   ~ to!string(p_["obj_cite_number"]) ~
-          ", \"parent_lev_markup_number\": " ~ to!string(p_["lev_markup_number"]) ~
-          " }"
-        );
+        auto _node = [
+          "object" : [
+            "is"                         : is_,
+            "heading_ptr"                : to!string(ptr_),
+            "doc_object_ptr"             : to!string(cntr_),
+            "obj_cite_number"            : to!string(obj_cite_number_),
+            "segment_anchor_tag"         : to!string(segment_anchor_tag),
+            "parent_obj_cite_number"     : to!string(p_["obj_cite_number"]),
+            "parent_lev_markup_number"   : to!string(p_["lev_markup_number"]),
+          ],
+          "heading" : [
+            "html_segnames_ptr"          : "",
+            "lev_markup_number"          : "",
+            "lev_collapsed_number"       : "",
+            // "ancestors"                  : "",
+            // "open_headings_to_close"     : "",
+          ]
+        ];
         debug(node) {
           if (match(lev_markup_number, rgx.levels_numbered_headings)) {
             writeln("x ", to!string(_node));
@@ -3789,15 +3921,14 @@ template SiSUdocAbstraction() {
             writeln("- ", to!string(_node));
           }
         }
-        JSONValue j = parseJSON(_node);
-        assert(j["parent_lev_markup_number"].integer >= 4);
-        assert(j["parent_lev_markup_number"].integer <= 7);
-        assert(j["parent_obj_cite_number"].integer >= 0);
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) >= 4);
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) <= 7);
+        assert(to!int(_node["object"]["parent_obj_cite_number"]) >= 0);      // hmm, perhaps
         return _node;
       }
       invariant() {
       }
-      string node_emitter_heading(
+      string[string][string] node_emitter_heading(
         string lev_markup_number,
         string lev_collapsed_number,
         string segment_anchor_tag,
@@ -3904,20 +4035,25 @@ template SiSUdocAbstraction() {
         default:
           break;
         }
-        _node=("{ " ~
-          "\"is\": \""                             ~ is_ ~ "\"" ~
-          ", \"heading_ptr\": "                ~ to!string(ptr_) ~
-          ", \"doc_object_ptr\": "             ~ to!string(cntr_) ~
-          ", \"html_segnames_ptr\": \""        ~ ((lev_markup_number == "4") ? (to!string(html_segnames_ptr)) : "") ~ "\"" ~
-          ", \"obj_cite_number\": "                ~ to!string(obj_cite_number_) ~
-          ", \"lev_markup_number\": "              ~ to!string(lev_markup_number) ~
-          ", \"lev_collapsed_number\": "           ~ to!string(lev_collapsed_number) ~
-          ", \"segment_anchor_tag\": \""           ~ segment_anchor_tag ~ "\"" ~
-          ", \"parent_obj_cite_number\": "         ~ to!string(p_["obj_cite_number"]) ~
-          ", \"parent_lev_markup_number\": "       ~ to!string(p_["lev_markup_number"]) ~
-          " }"
-        );
-        debug(heading) {
+        auto _node = [
+          "object" : [
+            "is"                         : is_,
+            "heading_ptr"                : to!string(ptr_),
+            "doc_object_ptr"             : to!string(cntr_),
+            "obj_cite_number"            : to!string(obj_cite_number_),
+            "segment_anchor_tag"         : to!string(segment_anchor_tag),
+            "parent_obj_cite_number"     : to!string(p_["obj_cite_number"]),
+            "parent_lev_markup_number"   : to!string(p_["lev_markup_number"]),
+          ],
+          "heading" : [
+            "html_segnames_ptr"          : ((lev_markup_number == "4") ? (to!string(html_segnames_ptr)) : ""),
+            "lev_markup_number"          : to!string(lev_markup_number),
+            "lev_collapsed_number"       : to!string(lev_collapsed_number),
+            // "ancestors"                  : to!string(ancestors),
+            // "open_headings_to_close"     : to!string(open_headings_to_close),
+          ]
+        ];
+        debug(node) {
           if (match(lev_markup_number, rgx.levels_numbered_headings)) {
             writeln("* ", to!string(_node));
           }
@@ -3927,35 +4063,34 @@ template SiSUdocAbstraction() {
             writeln("* ", to!string(_node));
           }
         }
-        JSONValue j = parseJSON(_node);
-        assert(j["parent_lev_markup_number"].integer <= 7);
-        assert(j["parent_obj_cite_number"].integer >= 0);
+        assert(to!int(_node["object"]["parent_lev_markup_number"]) <= 7);
+        assert(to!int(_node["object"]["parent_obj_cite_number"]) >= 0);
         if (match(lev_markup_number, rgx.levels_numbered_headings)) {
-          assert(j["lev_markup_number"].integer <= 7);
-          assert(j["obj_cite_number"].integer >= 0);
-          if (j["parent_lev_markup_number"].integer > 0) {
-            assert(j["parent_lev_markup_number"].integer < j["lev_markup_number"].integer);
-            if (j["obj_cite_number"].integer != 0) {
-              assert(j["parent_obj_cite_number"].integer < j["obj_cite_number"].integer);
+          assert(to!int(_node["heading"]["lev_markup_number"]) <= 7);
+          assert(to!int(_node["object"]["obj_cite_number"]) >= 0);
+          if (to!int(_node["object"]["parent_lev_markup_number"]) > 0) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) < to!int(_node["heading"]["lev_markup_number"]));
+            if (to!int(_node["object"]["obj_cite_number"]) != 0) {
+              assert(to!int(_node["object"]["parent_obj_cite_number"]) < to!int(_node["object"]["obj_cite_number"]));
             }
           }
-          if (j["lev_markup_number"].integer == 0) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_A);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_B) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_A);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_C) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_B);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_sect_D) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_sect_C);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_1) {
-            assert(j["parent_lev_markup_number"].integer <= DocStructMarkupHeading.h_sect_D);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_2) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_1);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_3) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_2);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_4) {
-            assert(j["parent_lev_markup_number"].integer == DocStructMarkupHeading.h_text_3);
-          } else if  (j["lev_markup_number"].integer == DocStructMarkupHeading.h_text_5) {
+          if (to!int(_node["heading"]["lev_markup_number"]) == 0) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_A);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_B) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_A);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_C) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_B);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_sect_D) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_sect_C);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_1) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) <= DocStructMarkupHeading.h_sect_D);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_2) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_1);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_3) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_2);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_4) {
+            assert(to!int(_node["object"]["parent_lev_markup_number"]) == DocStructMarkupHeading.h_text_3);
+          } else if  (to!int(_node["heading"]["lev_markup_number"]) == DocStructMarkupHeading.h_text_5) {
           }
         }
         return _node;
@@ -3965,7 +4100,10 @@ template SiSUdocAbstraction() {
     }
     /+ abstraction functions emitters ↑ +/
     /+ ↓ abstraction functions assertions +/
-    auto assertions_doc_structure(string[string] an_object, int[string] lv) {
+    auto assertions_doc_structure(
+      string[string] an_object,
+      int[string] lv
+    ) {
       if (lv["h3"] > State.off) {
         assert(lv["h0"] > State.off);
         assert(lv["h1"] > State.off);
diff --git a/src/sdp/ao_defaults.d b/src/sdp/ao_defaults.d
index 9a84e80..4408cc8 100644
--- a/src/sdp/ao_defaults.d
+++ b/src/sdp/ao_defaults.d
@@ -144,7 +144,7 @@ template SiSUregisters() {
     ];
     return meta_;
   }
-  auto pointer_head_main =
+  auto ptr_head_main =
     [
       "classify",
       "creator",
@@ -157,7 +157,7 @@ template SiSUregisters() {
       "rights",
       "title"
     ];
-  auto pointer_head_sub_classify =
+  auto ptr_head_sub_classify =
     [
       "dewey",
       "keywords",
@@ -165,7 +165,7 @@ template SiSUregisters() {
       "subject",
       "topic_register"
     ];
-  auto pointer_head_sub_creator =
+  auto ptr_head_sub_creator =
     [
       "author",
       "author_email",
@@ -173,7 +173,7 @@ template SiSUregisters() {
       "illustrator",
       "translator"
     ];
-  auto pointer_head_sub_date =
+  auto ptr_head_sub_date =
     [
       "added_to_site",
       "available",
@@ -183,14 +183,14 @@ template SiSUregisters() {
       "published",
       "valid"
     ];
-  auto pointer_head_sub_identifier =
+  auto ptr_head_sub_identifier =
     [
       "isbn",
       "oclc",
       "pg"
     ];
   /+ make +/
-  auto pointer_head_sub_make =
+  auto ptr_head_sub_make =
     [
       "cover_image",
       "home_button_image",
@@ -205,27 +205,27 @@ template SiSUregisters() {
       "texpdf_font",
       "css"
     ];
-  auto pointer_head_sub_notes =
+  auto ptr_head_sub_notes =
     [
       "abstract",
       "description"
     ];
-  auto pointer_head_sub_original =
+  auto ptr_head_sub_original =
     [
       "language",
       "source",
       "title"
     ];
-  auto pointer_head_sub_publisher =
+  auto ptr_head_sub_publisher =
     [ "name" ];
-  auto pointer_head_sub_rights =
+  auto ptr_head_sub_rights =
     [
       "copyright",
       "cover",
       "illustrations",
       "license"
     ];
-  auto pointer_head_sub_title =
+  auto ptr_head_sub_title =
     [
       "edition",
       "full",
@@ -350,6 +350,29 @@ template SiSUrgxInitFlags() {
     return flags_type_init;
   }
 }
+template SiSUnode() {
+  string[string][string] node_metadata() {
+    auto node_ = [
+      "object" : [
+        "is"                         : "",
+        "heading_ptr"                : "",
+        "doc_object_ptr"             : "",
+        "obj_cite_number"            : "",
+        "segment_anchor_tag"         : "",
+        "parent_obj_cite_number"     : "",
+        "parent_lev_markup_number"   : "",
+      ],
+      "heading" : [
+        "html_segnames_ptr"          : "",
+        "lev_markup_number"          : "",
+        "lev_collapsed_number"       : "",
+      //   "ancestors"                  : "",
+      //   "open_headings_to_close"     : "",
+      ],
+    ];
+    return node_;
+  }
+}
 template SiSUbiblio() {
   // required: deemed_author (author || editor); year; fulltitle;
   auto biblio_entry_tags_jsonstr =  `{
diff --git a/src/sdp/ao_object_setter.d b/src/sdp/ao_object_setter.d
index 35ca768..c293eb0 100644
--- a/src/sdp/ao_object_setter.d
+++ b/src/sdp/ao_object_setter.d
@@ -42,7 +42,7 @@ template ObjectSetter() {
   // heading segments, 1~ lev4:
     int heading_array_ptr_segments = 0; // TODO
   // node info json string:
-    string node                        = "";
+    string[string][string] node;
   }
   struct ObjComposite {
     string use                  = "";
@@ -78,6 +78,7 @@ template ObjectSetter() {
       in string lev,
       in int lev_int_markup,
       in int lev_int_collapsed,
+      in string[string][string] _node,
     ) {
       ObjComposite object_set;
       object_set.use                                 = "content";
@@ -184,7 +185,7 @@ template ObjectSetter() {
       in string type,
       in string object,
       in string obj_cite_number,
-      in string _node
+      in string[string][string] _node
     ) {
       ObjComposite object_set;
       object_set.use                               = "content";