Parties (Organizations and Individuals) can play various Roles in a Project. This could be at the Project, WBS or Activity level and so this has been abstracted to the ProjectElement level in this model.<br/>We will define an abstract role that all ProjectRoles will be derived from. A few concrete roles are shown as examples. Other roles may also be appropriate.<br/>Note that for implementation, PartyRole is most likely to be an Interface with ProjectPartyRole a root abstract class implementing the PartyRole interface.<br/>There will be other Role sets that may also be important for a Project. Only a few Project specific ones are shown here.<br/>
