[OASIS Issue Tracker] (ODATA-674) Specify navigation property binding combined with containment

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    [ https://issues.oasis-open.org/browse/ODATA-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=65457#comment-65457 ] 

Michael Pizzo commented on ODATA-674:
-------------------------------------

In proposal, 9b) should have been referring to Path.  The proposal (I believe) was that, for a 4.01 response, the last segment of Path can be either a navigation property or a cast segment; if cast segment, then only members of the (source) nav prop that are of that particular type are bound to the target entity set.

The same path can't occur multiple times, but the same nav prop can be in multiple paths, followed by different cast segments.

Where multiple such bindings occur for the same nav prop, the most specific path applies.

> Specify navigation property binding combined with containment
> -------------------------------------------------------------
>
>                 Key: ODATA-674
>                 URL: https://issues.oasis-open.org/browse/ODATA-674
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: CSDL XML, Implementing OData
>    Affects Versions: V4.0_OS
>         Environment: Applied
>            Reporter: Ralf Handl
>            Assignee: Michael Pizzo
>              Labels: Gap
>             Fix For: V4.01_CSD02
>
>
> This combination is not explicitly covered in the specification.
> There are two sides to this problem: 
> - target entity sets for contained entities
> - contained entity sets as target entity sets
> Both problems can be solved by allowing <NavigationPropertyBinding> elements as children of the structured type that defines the containment navigation property.
> Example 1: navigation property of a contained entity targets a top-level entity set:
>   <NavigationProperty Name="Items" Type="Collection(Model.OrderItem)" ContainsTarget="true" />
>   <NavigationPropertyBinding Path="Items/Product" Target="Model.Container/Products"/>
> Example 2: assume an Order contains Items and Shipments, and an Item refers to a single Shipment of the same Order and vice versa. Using paths that start at the type defining the containment navigation property, the Target would be "Shipments" and "Items".
> <EntityType Name="Order">
>   <NavigationProperty Name="Items" Type="Collection(Model.OrderItem)" ContainsTarget="true" />
>   <NavigationPropertyBinding Path="Items/Shipment" Target="Shipments"/>  
>   <NavigationProperty Name="Shipments" Type="Collection(Model.Shipment)" ContainsTarget="true" />
>   <NavigationPropertyBinding Path="Shipments/ShippedItems" Target="Items"/>
> </EntityType>
> <EntityType Name="OrderItem">
>   <NavigationProperty Name="Shipment" Type="Model.Shipment" Partner="ShippedItems"/>
> </EntityType>
> <EntityType Name="Shipment">
>   <NavigationProperty Name="ShippedItems" Type="Collection(Model.OrderItem)" Partner="Shipment"/>
> </EntityType>



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