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

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

     [ http://tools.oasis-open.org/issues/browse/ODATA-305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Zurmuehl updated ODATA-305:
----------------------------------

    Proposal: 
Define a symbolic path segment $count and allow to use this symbolic path segement at the end of the path attribute of the annotation element (see CSDL 16.2.10). See also in the description  --> alternative 1


  was:
Define the symbolic name odata.count and allow to use this symbolic name in the path attribute of the annotation element (see CSDL 16.2.10).
The special annotation odata.count is implicitly "annotated" for entity sets and represents the count of the collection. 


> Annotations: introduce path segment to address the count of a collection
> ------------------------------------------------------------------------
>
>                 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
>             Fix For: V4.0_WD01
>
>
> 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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