anchor.diff:  :uri-asciidoctor-api: http://asciidoctor.org/docs/user-manual/#api
   :uri-asciidoctor-extensions: http://asciidoctor.org/docs/user-manual/#extension-points
   :uri-blockdiag: http://blockdiag.com
  +:uri-bpmn: https://github.com/gtudan/bpmn-js-cmd
   :uri-ditaa: http://ditaa.sourceforge.net/
   :uri-dot: https://graphviz.gitlab.io/_pages/doc/info/lang.html
   :uri-erd: https://github.com/BurntSushi/erd
  
positive.code: |fontpath     |unspecified     |The path to the font that should be used by blockdiag
  |===
  
  ==== Ditaa
  
  [cols=">,<,<",options="header"]
  
negative.code: |{uri-a2s}[a2s]              |       |       |       |{check}|
  |{uri-actdiag}[actdiag]      |       |{check}|{check}|{check}|
  |{uri-blockdiag}[blockdiag]  |       |{check}|{check}|{check}|
  |{uri-bpmn}[bpmn]            |       |{check}|{check}|{check}|
  |{uri-ditaa}[ditaa]          |       |       |{check}|{check}|
  |{uri-erd}[erd]              |       |       |{check}|{check}|
  |{uri-gnuplot}[gnuplot]      |{check}|       |{check}|{check}|{check}
  