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From "Jay Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OLINGO-1096) Model as Singleton or EntitySet
Date Tue, 21 Mar 2017 02:58:41 GMT
Jay Xu created OLINGO-1096:

             Summary: Model as Singleton or EntitySet
                 Key: OLINGO-1096
                 URL: https://issues.apache.org/jira/browse/OLINGO-1096
             Project: Olingo
          Issue Type: Question
            Reporter: Jay Xu

In DMTF redfish schema ```ServiceRoot```, it defines 
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="ServiceRoot.v1_1_1">

      <EntityContainer Name="ServiceContainer" Extends="ServiceRoot.v1_0_0.ServiceContainer">
        <Singleton Name="StorageSystems" Type="StorageSystemCollection.StorageSystemCollection"/>
        <Singleton Name="StorageServices" Type="StorageServiceCollection.StorageServiceCollection"/>
        <Singleton Name="Fabrics" Type="FabricCollection.FabricCollection"/>
        <Singleton Name="UpdateService" Type="UpdateService.UpdateService"/>

      <EntityType Name="ServiceRoot" BaseType="ServiceRoot.v1_1_0.ServiceRoot"/>

Here is the schema definition of StorageSystemCollection:
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="StorageSystemCollection">

      <EntityType Name="StorageSystemCollection" BaseType="Resource.v1_0_0.ResourceCollection">
        <Annotation Term="OData.Description" String="A Collection of ComputerSystem resource
instances that each have an entry in HostingRoles set to 'StorageServer'."/>
        <Annotation Term="OData.LongDescription" String="An instance of this resource shall
reference the set of ComputerSystem resources known in the scope of its use and and that has
a HostingRoles entry with a value of 'StorageServer'."/>
        <NavigationProperty Name="Members" Type="Collection(ComputerSystem.ComputerSystem)"
          <Annotation Term="OData.Permissions" EnumMember="OData.Permission/Read"/>
          <Annotation Term="OData.Description" String="The value of each member references
a Storage System resource."/>  
          <Annotation Term="OData.LongDescription" String="The value of each member entry
shall reference a ComputerSystem resource that shall have a HostingRoles entry with a value
of 'StorageServer'."/>
          <Annotation Term="OData.AutoExpandReferences"/>
It is allowed to have the URL to access the singleton instance and one of its members as follow:

I tried to model StorageSystems as a singleton, but it is reported by Olingo that /redfish/v1/StorageSystem('Simple')
is malformed. If I model it as EntitySet which type is ComputerSystem, the type info of StorageSystemCollection
is missing. 

Could you please show me a light on that?

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