[OASIS Issue Tracker] Created: (ODATA-126) Metadata as an OData service

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

Metadata as an OData service
----------------------------

                 Key: ODATA-126
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-126
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: New Feature
          Components: OData CSDL v1.0, OData Protocol v1.0, OData URL Conventions v1.0
    Affects Versions: WD01
            Reporter: Ralf Handl
             Fix For: WD01


Instead of o monolithic XML metadata document the metadata could be made available as an OData service with a fixed schema:

Entity types
 - EntitySet
 - EntityType
 - Property
 - ValueAnnotation
 - ...

Entity sets
 - EntitySets
 - EntityTypes
 - Properties
 - VallueAnnotations
 - ...

This meta-service could be accessed via a canonical URL, ideally ~/$metadata/ with $format=atom/json or a corresponding Accept header.

This would allow accessing only parts of the metadata document the client is interested in and simplify parsing for clients: they only need to know how to interpret "normal" OData feed and entity response payloads without needing a separate metadata format.

It would also conveniently provide a JSON format for metadata.

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