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How do we make a UML object - an attribute, a Data Type, an enumeration - unselectable as far as being assinged to a Type Property of an Attribute?
We have tried:
1. Making the object visibility private compared to making it a package.
2. Making the object visibility protected compared to making it private.
3. Marking the abstract property TRUE (checkboxing it).
None of these marking methods appear to milit its assignment to a Type property.
We are trying to limit what a person composing message data classes can pick or assign, and reducing what objects are allowed to be assigned would be useful.