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Subject: [OASIS Issue Tracker] Commented: (ODATA-374) Returning heterogeneous types for a function call

    [ http://tools.oasis-open.org/issues/browse/ODATA-374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33319#action_33319 ] 

Ralf Handl commented on ODATA-374:

This is already possible using the built-in abstract type Edm.EntityType:

      <Function Name="CreatedEntities" ReturnType="Collection(Edm.EntityType)">
        <Parameter Name="before" Type="Edm.DateTimeOffset" Nullable="true" />
        <Parameter Name="after" Type="Edm.DateTimeOffset" Nullable="true" />

To call this function at the service root you add a function import to your default entity container

        <FunctionImport Name="CreatedEntities" Function="Model.CreatedEntities" />

Stylistic side-note: I named the function (import) using a noun because calling it will provide the verb:

    GET ~/CreatedEntities?after=datetimeoffset'2013-05-07T11:03Z'

Please close this issue if you are satisfied with this answer.

> Returning heterogeneous types for a function call
> -------------------------------------------------
>                 Key: ODATA-374
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-374
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: New Feature
>          Components: OData CSDL, OData Protocol 
>            Reporter: Anila Kumar GVN
> It is not clear if OData enables a service to return a collection of heterogenous entity/complex types as a response to a function call. 
> I want to return a collection of types in response to a function call but each of the items in the collection could belong to different entity types.
> Example:
> /OData.svc/GetCreatedEntities?before=xxxx-xx-xx&after=xxxx-xx-xx
> here GetCreatedEntities is a function call on my product that return a collection of entities that are Created in a given time period. Return Type is a Collection Type that could contain a Customer type, Order type etc.
> Is it supported in OData? 

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