anchor.diff:  [cols=">,<,<",options="header"]
   |===
   |Name          |Default value   |Description
  -|direction     |unspecifed      |The direction of the state machine diagram. One of `top-down`, `bottom-top`, `left-right` or `right-left`.
  +|direction     |unspecified     |The direction of the state machine diagram. One of `top-down`, `bottom-top`, `left-right` or `right-left`.
   |engine        |unspecified     |The layout engine to use. One of `dot`, `circo`, `fdp`, `neato`, `osage`, or `twopi`
   |===
   
  
positive.code: |style         |unspecifed      |Path to a style config file to pass to Syntrax.
  |transparent   |false           |Makes the background of the image transparent instead of opaque white.
  |===
  
negative.code:    |svgbob       |{uri-svgbob}[SvgBob]                                                  |`svgbob`
     |symbolator   |{uri-symbolator}[Symbolator]                                          |`symbolator`
     |syntrax      |{uri-syntrax}[Syntrax]                                                |`syntrax`
     |tikz         |{uri-tikz}[TikZ]                                                      |`tikz`
     |umlet        |{uri-umlet}[Umlet]                                                    |`umlet`
     |vega         |{uri-vega}[vg2png] and/or {uri-vega}[vg2png]                          |`vg2png` and `vg2svg`
     |vegalite     |{uri-vegalite}[vl2vg] and {uri-vega}[vg2png] and/or {uri-vega}[vg2svg]|`vl2vg`, `vg2png` and `vg2svg`
  