[OASIS Issue Tracker] Created: (ODATA-304) Add TargetKey attribute to <PropertyRef> within a <ReferentialConstraint

Add TargetKey attribute to <PropertyRef> within a <ReferentialConstraint
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                 Key: ODATA-304
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-304
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL
    Affects Versions: V4.0_WD01
         Environment: [Proposed]
            Reporter: Michael Pizzo
             Fix For: V4.0_WD01


Today we require that a <ReferentialConstraint> element contain the same number of <PropertyRef> elements, in the same order, as the <PropertyRef> elements of the <Key> of the related entity.

This is the only place where we rely on the ordering of the properties of the key.

We should instead add a TargetKey attribute to explicitly specify the key property of the related entity to which a <PropertyRef> within a <ReferentialConstraint> applies.

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