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

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

     [ http://tools.oasis-open.org/issues/browse/ODATA-319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Pizzo updated ODATA-319:
--------------------------------

    Proposal: 
Allow services to annotate the odata.metadata annotation with the odata.etag annotation to transport the current ETag of $metadata to clients:

{
  "odata.metadata": "http://host/service/$metadata";,
  "odata.metadata@odata.etag": "A1FF3E230954908F",
  ...
}

Allow services to return etag in metadata request and add a metadata link that MAY contain a metadata:etag attribute to Atom responses:

  <link rel="http://docs.oasis-open.org/odata/ns/metadata"; metadata:etag="A1FF3E230954908F" href="http://host/service/$metadata"; />

metadata is same as odata.metadata annotation in json.

  was:
Allow services to annotate the odata.metadata annotation with the odata.etag annotation to transport the current ETag of $metadata to clients:

{
  "odata.metadata": "http://host/service/$metadata";,
  "odata.metadata@odata.etag": "A1FF3E230954908F",
  ...
}

Allow services to add a metadata link that MAY contain a metadata:etag attribute to Atom responses:

  <link rel="http://docs.oasis-open.org/odata/ns/metadata"; metadata:etag="A1FF3E230954908F" href="http://host/service/$metadata"; />


> Allow services to include metadata links and metadata ETags into responses
> --------------------------------------------------------------------------
>
>                 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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