[higgins-dev] Persona data model updates

[Paul Trevithick <ptrevithick@xxxxxxxxx>]

I just committed these changes:
* persona.owl now imports the new event.owl [1] --see [2] (includes "verification" event type)
* more tweaks to how we're using vCard [3] 
* added a new constraint (for PDM 2.0 only) [5]: the context object's relative entityid is always "_ContextSingleton" --this will make it easy to find the context object

There is a nice, visual example here [4] of a credit bureau context that shows use of a verification event (and the use of _ContextSingleton entityid).

[1] http://wiki.eclipse.org/Persona_Data_Model_2.0#Imported_Ontologies
[2] http://wiki.eclipse.org/Persona_Data_Model_2.0#event.owl
[3] http://wiki.eclipse.org/Persona_Data_Model_2.0#vCard
[4] http://wiki.eclipse.org/Persona_Data_Model_2.0#Example_AppCard_and_AppData
[5] http://wiki.eclipse.org/Persona_Data_Model_2.0#Restrictions_on_CDM_2.0_EntityIds