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1. Define a generic method (or set of methods) for applying partial changes to datastreams.
2. Implement it for RELS-EXT and RELS-INT (RDF-based) so that additions and deletions to those datastreams can be made via SPARQL update.

Example:

• HTTP Verb: PUT POST
• URL: /objects/{pid}$pid/fedora-system:SomeBuiltInSDef/updateDatastream?dsID={dsID}$dsID&type=sparql-update
• Body: A SPARQL/Update document (UTF-8?) to apply to the datastream
• Successful response:
  • Code: 201
  • Location header: URL to datastream version
  • Content-type header: text/plain; charset=utf-8
  • Body: URL to datastream version
• Failed response :** If datastream doesn't exist: TBD (bad request):
  • Code: 400
  • Content-type header: text/plain; charset=utf-8
  • Body: (one-line message)
    • Unrecognized update type: $type
    • No such object: $pid
    • No such datastream in $pid: $dsID
  • If input document is malformed: TBD

Notes:

1. Modifying the entire content of a datastream would still be possible via a POST to the datastream URL as it is today.
2. The syntax for invoking disseminations has not yet been decided for the REST API; the URL above with fedora-system:SomeBuiltInSDef assumes an obvious possible syntax.

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