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Is the latex equation supported? rather than ascii math?

It was not.

But not very difficult to add. So in last beta https://dl.dropboxusercontent.com/u/13064071/plantuml.jar

You can have:

@startuml :<math>int_0^1f(x)dx</math>; :<latex>\sum_{i=0}^{n-1} (a_i + b_i^2)</latex>; @enduml Note that you have to install JLatexMath as explain at http://plantuml.com/ascii-math This has not been very tested, so feeback welcome!