MapGuide API Reference
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Gets an MgDataPropertyDefinition object that defines the property used to identify an object property uniquely.

Remarks:
This method is only used when the property contains a collection of objects. See MgObjectPropertyDefinition::GetObjectType.
Returns:
Returns an MgDataPropertyDefinition object if the type of the object property is MgObjectPropertyType::Collection or MgObjectPropertyType::OrderedCollection.