UML22 — UML2/Infra section 11.6.2/ Enumerations should not have attributes

11.6.2 of Infra and 7.3.16 of Super refer to the possibility of Enumerations having attributes: "A compartment listing the attributes for the enumeration is placed
below the name compartment." This concept does not make sense to me: an enumeration inherently represents a single value-set modeled through owned EnumerationLiterals.
The only type of attribute that might ever make sense is a derived attribute (e.g. Color.isPrimary).

Proposed resolution:
Add constraint to above sections on Enumeration to state that only attributes permitted are derived ones. Also that any Operation must have isQuery=true.

Enumeration literals are immutable, so writeable attributes do not make sense. But read-only attributes do
make sense: they don’t need to be derived. The current description of equality of EnumerationLiterals needs
improvement. Operations on enumerations are allowed.
This also resolves 17933