* Due to the org-babel bug which breaks Python source code examples
  beyond the most simple snippets, ported the HOWTO to a source format
  which I *know* for sure won't break it.
* Details of the org-mode bug is in https://dev.gnupg.org/T3977
* DITA project uses DITA-OT 2.x (2.4 or 2.5, IIRC) with support for DITA 1.3.
* source files were written with oXygenXML Editor 20.0, hence the
  oXygenXML project file in the directory; however only the .ditamap
  and .dita files are required to generate any output with the
  DITA-OT.