[OASIS Issue Tracker] Created: (ODATA-319) Allow services to include metadata links and metadata ETags into responses

Allow services to include metadata links and metadata ETags into responses
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                 Key: ODATA-319
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-319
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData ATOM Format , OData JSON Format
    Affects Versions: V4.0_WD01
         Environment: [Proposed]
            Reporter: Ralf Handl
             Fix For: V4.0_WD01


As we defined a list of compatible changes to the data model of a service, it would be useful to notify clients that the metadata has changed, so they can re-read $metadata.

As the new JSON format in two of its flavors already includes the metadata link, we could just add a metadata etag that clients can compare to the etag of the cached version of $metadata.

While we are at it, we can add a metadata link to Atom responses.

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