[OASIS Issue Tracker] Commented: (ODATA-481) Annotation/Navigation/Path expressions: allow paths to continue after multi-valued navigation to e.g. drill into complex properties

[ http://tools.oasis-open.org/issues/browse/ODATA-481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34779#action_34779 ] 

Ralf Handl commented on ODATA-481:
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We definitely need several multi-valued navigation segments: all the products ordered by all my customers are My/Customers/Orders/Items/Product - two multi-valued navigations away from me. 

We can argue whether this identifies a collection produced by concatenating several collections, with identical entities occuring several times, or whether it identifies a set, where each identity appears at most once.

I'm fine with both: the "collection/concatenation" definition would be more consistent with complex and primitive instances that don't have an identity, and it would require the "annotation consumer" on top of a generic "annotation library" to remove duplicates if they are not wanted.

> Annotation/Navigation/Path expressions: allow paths to continue after multi-valued navigation to e.g. drill into complex properties
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ODATA-481
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-481
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData CSDL
>    Affects Versions: V4.0_CS01
>         Environment: [Proposed][CS02]
>            Reporter: Ralf Handl
>             Fix For: V4.0_CSD03
>
>
> CSDL 14.5.12 restricts path expressions to contain at most one multi-valued navigation property which can only be followed by a single type cast or term cast.
> This is overly restrictive: drilling into a complex type path after a navigation is straight-forward, and even multiple multi-valued navigations could be resolved by building the union of all targeted collections.

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