Is there an official UML Activity diagram meta model in form of an ecore or xsd file out there? By official I mean published by the OMG or a other consortium.
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Yes, the eclipse foundation has a really great UML Model in the MDT project. It is used for a lot of tools like Rational Software Architect by IBM or UML Lab by Yatta and open source ones like TOPCASED.
You can use it flattened (all package merges already executed) as EMF/ecore generated Java source. Or you can use it as .uml (XMI with UML EMF model file).