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+
+***** urls
+
+#% markdown
+<http://daringfireball.net/projects/markdown/>
+<http://daringfireball.net/projects/markdown/syntax>
+<http://daringfireball.net/projects/markdown/basics>
+<http://en.wikipedia.org/wiki/Markdown>
+<https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet>
+<http://whatismarkdown.com/>
+
+Markdown supports two styles of headers, Setext and atx
+Setext
+<http://docutils.sourceforge.net/mirror/setext.html>
+<http://en.wikipedia.org/wiki/Setext>
+atx
+<http://www.aaronsw.com/2002/atx/intro>
+
+<http://support.iawriter.com/help/kb/general-questions/markdown-syntax-reference-guide>
+<http://bywordapp.com/markdown/syntax.html>
+<http://stackoverflow.com/editing-help>
+
+<http://support.mashery.com/docs/customizing_your_portal/Markdown_Cheat_Sheet>
+<http://warpedvisions.org/projects/markdown-cheat-sheet.md>
+<http://nestacms.com/docs/creating-content/markdown-cheat-sheet>
+<https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet>
+
+<https://help.github.com/articles/github-flavored-markdown>
+<http://lifehacker.com/5943320/what-is-markdown-and-why-is-it-better-for-my-to+do-lists-and-notes>
+
+#% pandoc markdown
+<http://johnmacfarlane.net/pandoc/demo/example9/pandocs-markdown.html>
+<http://johnmacfarlane.net/pandoc/README.html>
+<http://johnmacfarlane.net/pandoc/demo/example19/Pandoc_0027s-markdown.html>
+<http://johnmacfarlane.net/pandoc/>
+<http://johnmacfarlane.net/pandoc/epub.html>
+<http://johnmacfarlane.net/pandoc/faqs.html>
+
+#% multimarkdown
+<http://fletcher.github.io/peg-multimarkdown/>
+
+#% markdown pandoc v multimarkdown
+<https://github.com/jgm/pandoc/wiki/Pandoc-vs-Multimarkdown>
+
+#% rST v markdown
+<http://stackoverflow.com/questions/34276/markdown-versus-restructuredtext>
+
+***** rb file
+lib/sisu/v6/txt_markdown.rb
+
+***** transformations :transformations:markup_markdown: #%
+#% structure - headings, levels
+  [] sisu (A-C, 1-3)
+  [] collapsed (1-6) (decoration)
+    [inline 1-5]
+      '#'
+      '##'
+      '###'
+      '####'
+      '#####'
+      '######'
+    [underscore 1-5]
+      '='
+      '-'
+      #'~'
+      #'^'
+      #'+'
+  [] node (child, parent ...)
+
+#% font face
+  [open & close marks]
+  [] bold
+      '**'
+  [] italics
+      '*'
+  [] underscore
+      ''
+  [] superscript
+      ''
+  [] subscript
+      ''
+  [] strike
+      ''
+  [] add
+  [] monospace
+      '`'
+
+#% para
+  [] default
+  [] indent
+    [] default, all
+    [] first line hang or indent further
+  [] bullet
+      '*'
+  [] numbered list
+      '0.'
+
+#% blocks
+  [] code
+    '    ' #indent at least 4 spaces
+    [] [type of markup if any]
+  [] poem
+  [] group
+  [] alt
+  [] tables
+
+#% notes
+  [] footnotes
+    [] [bibliography?]
+
+#% links, linking
+  [] links - external, web, url
+  [] links - internal
+
+#% images [multimedia?]
+  [] images
+    [] [base 64]
+
+#% object numbers
+  [] ocn (object numbers)
+
+#% contents
+  [] toc (table of contents)
+  [] index (book index)
+
+#% breaks
+  [] line break
+  [] horizontal rule
+      (three or more asterisks hypens or underscores)
+      * * *
+      ***
+      *****
+      - - -
+    ___
+  [] column break
+  [] page break
+
+#% misc
+