added location and location adapter
added location and location adapted, + test
typed object
introduced Location type
other typed values
other typed values
other typed values
support for roles
support for roles
support for type
support for type
support for values
persistence support: roundtrip
replaced AnyRef by IDRef
replaced EntityRef and ActivityRef by IDRef
replaced EntityRef and ActivityRef by IDRef
replaced GenerationRef and Usage by IDRef
replaced AgentRef by IDRef
introducing prov.model, build broken
refactoring model out of xml (compilation still broken)