...

In

...

order

...

to

...

consider

...

Fedora's

...

REST

...

API

...

functionally

...

complete,

...

we

...

need

...

to

...

have

...

built-in

...

support

...

for

...

adding,

...

modifying,

...

and

...

removing

...

RDF

...

relationships.

Strawman Proposal

Define a generic method (or set of methods) for applying partial changes to datastreams.

Implement it for RELS-EXT and RELS-INT so that additions and deletions can be made via SPARQL update.

Example:

• HTTP Verb: PUT
• URL: /objects/{pid}/fedora-system:/updateDatastream?dsID={dsID}&type=sparql-update

...

• Body:

...

• A

...

• SPARQL/Update

...

• document

...

• (UTF-8?)

...

• to

...

• apply

...

• to

...

• the

...

• datastream

...

• Successful

...

• response:

...

• • Code:

...

• • 201

...

• • Location:

...

• • URL

...

• • to

...

• • datastream

...

• Failed

...

• response:

...

• • If

...

• • datastream

...

• • doesn't

...

• • exist:

...

• • TBD

...

• • If

...

• • input

...

• • document

...

• • is

...

• • malformed:

...

• • TBD

Notes from 11/3 Committer Meeting

HTTP PUT/POST to RELS-EXT/INT.
SPARQL Update
URL Parameter, "kind of update" (possibly could be trigger)
....could be alternative to mime type (some clients can't control headers well)
Validation would happen.
Have it use fedora-system:sdef...accept a POST.
Doesn't require that we do it in the general case.
PUT should be idempotent (to replace the entire datastream)
POST has no such requirement (so to add/delete specific relationships)
Important: Make sense of it for users