anchor.diff:     |a2s          |{uri-a2s}[AsciiToSvg]                                                 |`a2s`
      |actdiag      |{uri-actdiag}[ActDiag]                                                |`actdiag`
      |blockdiag    |{uri-blockdiag}[BlockDiag]                                            |`blockdiag`
  +   |bpmn         |{uri-bpmn}[bpmn-js-cmd]                                               |`bpmn`
      |ditaa        |{uri-java}[Java]                                                      |`java`
      |erd          |{uri-erd}[Erd]                                                        |`erd`
      |gnuplot      |{uri-gnuplot}[Gnuplot]                                                |`gnuplot`
  
positive.code: |fontpath     |unspecified     |The path to the font that should be used by blockdiag
  |===
  
  ==== Ditaa
  
  [cols=">,<,<",options="header"]
  
negative.code: :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
  