[OASIS Issue Tracker] (ODATA-1067) Consider ability to define computed default values

Michael Pizzo created ODATA-1067:
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             Summary: Consider ability to define computed default values
                 Key: ODATA-1067
                 URL: https://issues.oasis-open.org/browse/ODATA-1067
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Bug
          Components: CSDL JSON , CSDL XML
    Affects Versions: V4.01_WD01
            Reporter: Michael Pizzo
             Fix For: V4.01_CS02


Currently, default values for properties and (now, as of ODATA-1066) parameters are static values.

There are some cases where the default value may be the result of a calculation. Examples:
1) The value of a related property/parameter
2) An expression based on the value of one (or more) related properties/parameters
3) The result of invoking a function(import) on the service (with params?)

Issues: 
-how to express the value of the defaultvalue (use Edm.Untyped? -- this could only be supported in 4.01)
-what is the syntax of the expression?
-can it invoke a funciton(import) and, if so, how are parameters passed?

For parameters, could define a derived OptionalParameterType that has a DefaultValueExpression that is Edm.Untyped and only returned as that derived type in a 4.01 payload.




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