[OASIS Issue Tracker] Created: (ODATA-494) Add possibility to "extend" enumeration types with additional values

Add possibility to "extend" enumeration types with additional values
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                 Key: ODATA-494
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-494
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL
    Affects Versions: V4.0_CS
            Reporter: Ralf Handl
             Fix For: V4.1_WD01


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. 

It's sort of inheritance for enumerations, given the fact that some programming languages implement enumerations as classes/objects with members/properties for the enumeration values. 

So we could add an attribute "BaseType" or "Extends" for EnumType to add new enumeration values.

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