[OASIS Issue Tracker] Created: (ODATA-305) Annotations: introduce path segment to address the count of a collection

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

Annotations: introduce path segment to address the count of a collection
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                 Key: ODATA-305
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-305
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL
    Affects Versions: V4.0_WD01
         Environment: [Proposed] 
            Reporter: Martin Zurmuehl


Annotations: introduce path segment to address the count of a collection: We could use /$count or @odata.count. 
The first is consistent with URL rules, the second with odata.mediaContentType etc. that we introduced recently in ODATA-227.

<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx";>
  <edmx:Reference Url="http://services.odata.org/V3/OData/OData.svc/$metadata"; />
  <edmx:DataServices>
    <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm"; Namespace="CountSample" Alias="CS">

      <Term Name="MostImportantDataFields" Type="Collection(CS.DataFieldType)" />
      <ComplexType Name="DataFieldType">
        <Property Name="Label" Type="String" Nullable="true" />
        <Property Name="Value" Type="Edm.PrimitiveType" Nullable="false" />
        <Property Name="NavigationPath" Type="Edm.NavigationPropertyPath" Nullable="true" />
      </ComplexType>

      <Annotations Target="ODataDemo.Category">
        <Annotation Term="CS.MostImportantDataFields">
          <Collection>
            <Record>
              <PropertyValue Property="Label" String="Category Name" />
              <PropertyValue Property="Value" Path="Name" />
            </Record>
            <Record>
              <PropertyValue Property="Label" String="Numbers of Products related to this Categrory" />
              <!-- Alternative 1 -->
              <PropertyValue Property="Value" Path="Products/$count" /> <!-- see $orderby and $filter -->
              <!-- Alternative 2 -->
              <PropertyValue Property="Value" Path="Products@odata.count" /><!-- see CSDL 16.2.10 The edm:Path Expression -->
              <PropertyValue Property="NavigationPath" NavigationPropertyPath="Products" />
            </Record>
          </Collection>
        </Annotation>
      </Annotations>
    </Schema>
  </edmx:DataServices>
</edmx:Edmx>


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