[Zope] How to access the properties of a structured text document in a monkeyPatch

Hi, to extend the standart StructuredText tool of zope via monkey patch I need to acces the stx-object's properties. Does anybody know how to do that? In the patch ( a __init.py__ in ../python/Products/myPatch/) I guess to use something like getattr(obj, 'myPropertyId'). But how to get reference to the obj? Thanks for any help Elena