- build pod structure, and
- minimal requirement for a document
- at the requested path
- uses rund (as D script compiler)

- document header and body
  - .sst .ssm split into header and body
  - .ssi body only, (no document header)
- change tracking of code blocks

- new dir for markup tools
  misc/util/d/tools/markup_conversion
- start looking at tools for converting
  - endnotes from binary to inline
  - sisu.rb to sisu spine in d
  - look at conversion of document headers to yaml
    from
    - bespoke sisu headers (original .rb)
    - sdlang
    - toml

- the d version of sisu requires inline endnotes
- rudimentary tool, the original (ruby) version of
  sisu permitted binary endnotes (markup for a an
  endnote and the reference to it within the body
  of text), it was easier to convert some existing
  html to this form, however it is much less
  reliable, and more difficult to keep track of
  individual endnotes, so this is a tool to help
  in the conversion of any existing sisu markup
  documents with binary endnotes to inline
  endnotes, testing required