TEX11 — Identity Enumeration doesn't have Enum attributes

The Identity enumeration (and also Environment and TrackPhase) have attributes that are modelled as Properties not Enumeration Literals.
E.g. for PENDING, in the XMI it is an ownedAttribute element with xmi:type="uml:Property"
For 'properly' modelled enums an ownedLiteral element with xmi:type="uml:EnumerationLiteral" is expected.
This causes problems with PSM generation and a misrepresentation on diagrams where there is additional text 'Attributes' and the enums have a superfluous + (for public) decorator.