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Re: RDFa Profiles, terms, and predicates (oh my!)

From: Manu Sporny <msporny@digitalbazaar.com>
Date: Thu, 22 Jul 2010 23:56:30 -0400
Message-ID: <4C4912EE.2030206@digitalbazaar.com>
To: RDFa WG <public-rdfa-wg@w3.org>
On 07/22/2010 05:28 PM, Shane McCarron wrote:
> Quick follow-up.  When using the predicate 'rdfa:uri', the object
> literal needs to be a URI.  Presumably it can be a relative URI:
> 
>    <p id='myTerm' about="#myTerm"><span property='rdfa:uri'
>    content='#myTerm'><span property='rdfa:term'>myTerm</span></span></p>
> 
> If not... we should really say so.  If so.... we should probably say
> that too. And make it clear what the relative URI is resolved against
> (current base?).

I'm having a hard time remembering why we need rdfa:uri. In other words,
why can't we just infer terms from triples that look like this in an
RDFa Profile document:

<http://example.org/vocab#foo-term> rdfa:term "foo" .

Why do we need rdfa:uri at all? The same goes for prefix:

<http://example.org/vocab#> rdfa:prefix "ex" .

and for the default vocabulary:

<http://example.org/vocab#> rdf:type rdfa:DefaultVocabulary .

The markup is cleaner if we get rid of rdfa:uri too. We go from this:

<div about="#foo">
   <span property="rdfa:term">foo</span> maps to
   <span property="rdfa:uri">http://example.org/vocab#foo-term</span>
</div>

to this (if the terms and vocabulary are in the same document):

<span about="#foo-term" property="rdfa:term">foo</span>

or this (if the terms are specified in a different document from the
vocabulary):

<span about="http://example.org/vocab#foo-term"
      property="rdfa:term">foo</span>

Seems to me that we shouldn't require both rdfa:term /and/ rdfa:uri to
establish a term when just a rdfa:term would suffice for all of our use
cases.

I think we should get rid of rdfa:uri completely - it's unnecessarily
repetitive and complicates the markup. Added bonus is that we don't have
to add more rules for the problem Shane is describing above.

Am I missing anything?

-- manu

-- 
Manu Sporny (skype: msporny, twitter: manusporny)
President/CEO - Digital Bazaar, Inc.
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Received on Friday, 23 July 2010 03:57:15 GMT

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