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Type:
Task
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: V4.0_WD01
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Fix Version/s: V4.0_WD01
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Component/s: URL Conventions
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Labels:None
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Environment:
[Closed]
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Resolution:
I would like to seek clarification on below scenario....
Suppose, I have 3 entity types 1) VirtualSystem 2) HyperVSystem and 3) VMWareSystem. Here, VirtualSystem is the base EntityType for both HyperVSystem and VMWareSystem. Now, if I define EntityContainer having only EnitySet for VirtualSystem. Are the following URLs correct?
1) http://host/service/VirtualSystems
Returns only instances of EntityType VirtualSystem
2) http://host/service/VirtualSystems/HyperVSystem
Returns only instances of EntityType HyperVSystem
3) http://host/service/VirtualSystems/VMWareSystem
Returns only instances of EntityType VMWareSystem
How to get all instances of VirtualSystem, HyperVSystem and VMWareSystem in a single query?
Thank you for the clarification. It is good if Spec is updated with such details.
What is the best way to limit "http://host/service/VirtualSystems" return only instance of VirtualSystem type but not derived types' instances. Can spec include query option?
I think the samples given by Ralf are derived from those in section 4.9 as he indicates, thus "the Spec" contains "such details" already 
Is there a possibly less irritating sample you might offer for the follow-up question, where you only want the base type instances not including any derived type instances? I find myself caught in regarding these derived types as concrete types for the virtual type "VirtualSystem" ... and wonder if the intended latter query is a quest for NULLs so to say, those where another concrete type was not yet defined to put candidates in ... as I said, I am not sure where you are heading at ... otherwise $filter is a nice system query option ...
So having said that I second Ralf in asking to close the issue with no action.
Thank you.
http://host/service/VirtualSystems will return all instances of VirtualSystem, HyperVSystem and VMWareSystem in a single query.
http://host/service/VirtualSystems/Model.HyperVSystem will restrict to instances of type "HyperVSystem" in schema "Model", and instances of any type that further specializes Model.HyperVSystem.
http://host/service/VirtualSystems/Model.VMWareSystem will similarly restrict to instances of Model.VMWareSystem and its specializations.
This is described in URL Conventions, section 4.9 Addressing Derived Types.
We don't have a way to only request instances of Model.VirtualSystem that are not also instances of a derived type.
If you are satisfied with this, please close the issue.