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Subject: Dialog discovery: triple and Link header for discovery of dialogs won't be on same resources


We have three mechanisms of discovering dialogs:
Link headers & Prefer headers: http://tools.oasis-open.org/version-control/browse/wsvn/oslc-core/jra-editing/specs/dialogs.html#discovery_link
and oslc:selectionDialog/oslc:creationDislog triples in oslc:Service resources: http://tools.oasis-open.org/version-control/browse/wsvn/oslc-core/jra-editing/specs/discovery.html#dialogs

I had previously expected that these headers and these triples would be on the same resources, but they cannot be.

The triples are on oslc:Service resources, but OSLC v2 requires that these resources be "Local Resources", which it defines to mean blank nodes (although I need to raise a separate issue to clarify whether the intention was to allow for hash URIs or not). "Local Resources" cannot have headers of their own, so oslc:Service resources cannot have Link header. (If they have hash URIs, technically they can have their own Link headers, but I don't suggest we go down that route.)

The Link and Prefer headers will be on LDPs themselves. (Although currently I don't think we have a good way of finding those LDPCs).

Is everyone else ok with the fact that these headers and triples will be on different resources? I just wanted to make sure we're clear what the situation is and are ok with it.

(This might make more sense in the context of my previous email and the wiki page it links to, where I'm thinking about how a server with one or more LDP containers makes those containers and their capabilities discoverable using OSLC).

Martin Pain
Software Developer - Green Hat
Rational Test Virtualization Server, Rational Test Control Panel


E-mail: martinpain@uk.ibm.com
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