[OASIS Issue Tracker] (ODATA-796) Add annotation to specify whether additional properties may be returned for an entity

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Michael Pizzo created ODATA-796:
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             Summary: Add annotation to specify whether additional properties may be returned for an entity
                 Key: ODATA-796
                 URL: https://issues.oasis-open.org/browse/ODATA-796
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Bug
          Components: OData CSDL
    Affects Versions: V4.0_ERRATA02
         Environment: [Proposal]
            Reporter: Michael Pizzo
             Fix For: V4.0_ERRATA03


In OData V3 only opentypes were allowed to return properties not advertised in $metadata.

In OData V4, for increased resiliency, we said that clients should be prepared to handle additional properties on any resource, and the introduction of PATCH as the preferred method for updating allows that to happen without loss.

However, we lost the ability for a service to say that they will never return additional properties (which is probably the default case). Since clients are required to support additional properties we didn't think this was important, but as we look to a json-schema format it becomes interesting for telling clients (i.e., for validation) whether or not additional properties are allowed.



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