[OASIS Issue Tracker] (ODATA-1181) Clarify $expand=NavSingle/$count and $expand=*/$count

Ralf Handl created ODATA-1181:
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             Summary: Clarify $expand=NavSingle/$count and $expand=*/$count
                 Key: ODATA-1181
                 URL: https://issues.oasis-open.org/browse/ODATA-1181
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: URL Conventions
    Affects Versions: V4.01_CS01
         Environment: Proposed
            Reporter: Ralf Handl
             Fix For: V4.01_CS02


Section 4.8 only defines the /$count segment for collection-valued paths.

Section 5.1.2 does not state a restriction to collection-valued navigation properties for $expand=NavProp/$count and similar paths.

We could allow /$count for all kinds of paths, returning 1 for single-valued navigation paths to an existing resource, and returning 0 for single-valued navigation paths that would return 204 or 404 without the /$count suffix.

Building on that $expand=*/$count could be defined to return the count of related entities for all navigation properties.



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