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namespace versioning (Dublin Core) use case for DAWG?

From: Dan Brickley <danbri@w3.org>
Date: Fri, 3 Sep 2004 13:35:02 -0400
To: public-rdf-dawg-comments@w3.org
Cc: public-swbp-wg@w3.org
Message-ID: <20040903173502.GQ32317@homer.w3.org>

(sent to DAWG feedback list, cc: Best Practices WG)

Hi

Apologies if this is already covered and I missed it.

I'd like DAWG to consider a use case in which a client application wants 
all the "Dublin Core titles and descriptions" of some object, eg.
Danbri's weblog(s), and doesn't care at all which concrete Dublin Core
namespace is used.

ie. 
	http://purl.org/dc/elements/1.0/
	http://purl.org/dc/elements/1.1/

This is a practical issue w/ DC deployment. I'm ignoring for now the
additional mess around upper/lowercase. Assume that we see dc10:title
and dc11:title in data, that the semantics are pretty much the same but
that the schemas aren't explicitly/formally mapped using RDFS or OWL
constructs.

A couple of approaches leap to mind: 'or'ing, vs. query-specific
assumptions, ie. allowing the query to say "Well, let's temporarily
assume that dc1:title is a subproperty of dc2:title and vice-versa,
...".

Both approaches have their issues (eg. 'or'ing both dc:title and
dc:description in a larger query might be hairy), 
but my sense is that there is a real problem when similar 
namespaces where new URIs have been assigned 
despite modest differences in meaning. If DAWG ends up deciding not to 
create technology that soothes these issues, the Best Practices WG might
consider making reference to querying issues when it discusses best
practice for Vocabulary Management and versioning.

cheers,

Dan

ps. Eric P, perhaps you could comment on how this is dealt with in
Annotea's treatment of Dublin Core 1.0 vs 1.1?
Received on Friday, 3 September 2004 17:35:03 GMT

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