[OASIS Issue Tracker] Created: (ODATA-397) Lazy loading of Annotations: Add optional Attribute "TargetNamespace" to edmx:IncludeAnnotations element

Lazy loading of Annotations: Add optional Attribute "TargetNamespace" to edmx:IncludeAnnotations element
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                 Key: ODATA-397
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-397
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL
    Affects Versions: V4.0_CSD01
         Environment: [Proposal]
            Reporter: Martin Zurmuehl
             Fix For: V4.0_CSD01


If a term is annotated at a model element (with an optional qualifier), this annotation is uniquely identified by (the "target" model element, the term, the qualifier). E.g. the following annotation is identified by (com.sap.erp.products.Product,UIVA.DataFieldWithNavigation,FirstDataField):
      <Annotations Target="com.sap.erp.products.Product">
        <Annotation Term="UIVA.DataFieldWithNavigation" Qualifier="FirstDataField">
          <Record>
            <PropertyValue Property="Label" String="Supplier" />
            <PropertyValue Property="Value" Path="@com.sap.AnnoCrossReferenceTerm.Supplier#Foo/SupplierName" />
          </Record>
        </Annotation>
      </Annotations>
This annotation uses a other annotation in the path attribute identified by (com.sap.erp.products.Product,com.sap.AnnoCrossReferenceTerm.Supplier,Foo). If this annotation is not included in the same file as the sample annotation above, the consumer has to load this annotation to figure out the annotation value. How can he find the right edmx:reference URI? Today we can qualify an edmx:includeAnnotation element inside an edmx:reference element by a TermNamspace attribute (MUST) and a Qualifier attribute (MAY). In our example he can search for (com.sap.AnnoCrossReferenceTerm,Foo) inside the edmx:includeAnnotation elements and load all matching edmx:reference files. There can be many. 
If we allow annotation providers to express in addition to the TermNamespace and the Qualifier a so called TargetNamespace (the namespace the annotated model element belongs to), the number of matching files could be reduced, because the consumer can search for (com.sap.erp.products,com.sap.AnnoCrossReferenceTerm,Foo) inside the edmx:includeAnnotation elements and load only the  edmx:reference files matching this more specific search query.

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