[OASIS Issue Tracker] (ODATA-849) Add possibility for enumeration types to "extend" other enumerations

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Michael Pizzo created ODATA-849:
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             Summary: Add possibility for enumeration types to "extend" other enumerations
                 Key: ODATA-849
                 URL: https://issues.oasis-open.org/browse/ODATA-849
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: New Feature
          Components: OData CSDL
    Affects Versions: V4.0_ERRATA02
         Environment: [Proposed]
            Reporter: Michael Pizzo
            Priority: Minor
             Fix For: V4.01_WD01


[Alternative to ODATA-494]

We currently don't have a way for adding values to an enumeration type. This would be helpful for defining custom vocabularies that extend base vocabularies. 

 However, defining inheritance for enumerations introduces substitutability that is likely to break clients by returning new enumeration values not anticipated by the client (for instance, in a switch statement). 

 An alternative to inheritance would be to introduce the ability for an enumeration type to *definitionally* extend an existing enumeration type. This is similar to what we do with entity containers, which can extend the definition of an existing container without introducing any substitutability. 

 We could even use the same "Extends" attribute, rather than "BaseType" which implies inheritance. 
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