Eclipse plugin open document

I need to write an Eclipse plugin which uses the SOA BPMN modeler (http://www.eclipse.org/bpmn/) to model a diagram in Eclipse's main view (the central one).

My idea is: what if I create a hello.bpmn_diagram file and load it into eclipse? That would make my life easier when the us开发者_开发百科er saves the file (it is already on disk)

Any other idea or suggestion is very appreciated

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Alexey Kalmykov gave the right insight: the extension points (useless unfortunately), were in the MF file of the source code