UML14 — OCL: Enumeration types

When an enumeration constant is used, it has to be preceded by the
hash '#' sign. While this is not strictly necessary, it certainly
makes parsing easier and, therefore, can stand as it is.

However, the need for the same hash characters in the definition of
the enumeration types, like in

enum

is what the OCL grammar currently requires ­ and in this context
the hash characters should probably be abolished, because:

• Their presence does not give anything significant to user
  because name conflicts can't happen inside the enumeration type
  definition. Everything inside the curly brackets {} is enumeration
  constants.
• Normally, one can try to copy-paste some text between UML and OCL
  parts of the class model. This is made a bit tricky, because UML and
  OCL use
  different syntax for the enumeration types. It would
  be nice of OCL could adopt the UML syntax.

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