PPMN_ — Line 984 Table 5 Description of attribute part is ambiguous

The description of Entity attribute part which is a derived attribute says: the Entity or Entities that is/are contained by the Entity.
This may be ambiguous and misleading since the notion of containment differs from the notion of composition. The attribute part is derived so we should be explicit about its computation which in this case is the collection of all EntityRelationships of kind Composition from SCE ElementRelationship RelationshipKind.

Update text and diagrams to describe EntityRelationship and EntityRelationshipType

The current specification does not provide a detailed description of the relationships between Entities. These are intended to be specified by the EntityRelationship.kind property whose type is SCE RelationshipKind. the parts are the Entities pointed to by a EntityRelationship with a kind property set to "Composition". The text will be updated to describe this and a diagram will be added as well to show these relationships.