My personal version of PlantUML (LGPL version) with fixes and enhancements I need.

1. build PlantUML9000 with ant, the default target will create the file plantuml9000.jar.
2. after this you can create the pdf file of the Sphinx demo. Go to the sphinx-demo directory and type make latexpdf.
3. the resulting pdf can be found in sphinx-demo/build/latex.

This version of PlantUML comes integrated with Salt9000 an ANTLR parser for the Salt language that comes with PlantUML. Salt9000 however use pure Swing to render UI so the result is as realistic as the real application.

However this does not work in a headless java environment due to the Java rendering constraints.

There is a sample Sphinx project into sphinx-demo to see how to use PlantUML9000 with Sphinx, that was my final need.

This standard Salt example:

is renderer this way by Salt9000:

Check the sphinx source to see the source code of these examples.