W3C home > Mailing lists > Public > public-rdf-dawg@w3.org > October to December 2004

Re: let's allow the same terms everywhere, esp in triple patterns

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Mon, 22 Nov 2004 15:28:19 +0000
Message-ID: <41A20593.2040403@hp.com>
To: Dan Connolly <connolly@w3.org>
CC: RDF Data Access Working Group <public-rdf-dawg@w3.org>



Dan Connolly wrote:
> w.r.t.
> 
> 
> The set of triple patterns is
>     (RDF-U union RDF-B union V) x (RDF-U union V) x (RDF-T union V)
> 
>   http://www.w3.org/2001/sw/DataAccess/rq23/
>   $Revision: 1.137 $
> 
> Let's make that
>     (RDF-T union V) x (RDF-T union V) x (RDF-T union V)
> 
> True, literal subjects and bnode predicates won't match any graphs
> made from RDF/XML documents, but the RDF Core WG
>  "noted that it is aware of no reason why literals should not
>   be subjects and a future WG with a less restrictive charter may
>   extend the syntaxes to allow literals as the subjects of statements."
>    -- http://www.w3.org/2000/03/rdf-tracking/#rdfms-literalsubjects
> 
> 

Dan - could you say some more?  What does it make easier/simpler/clearer/etc?  A 
pre-WD version had the more general form and there was WG review comment raised 
about it and it was changed to the current form [*].

As far as I can see, having a more general set of triple patterns only really 
effects one other definition where a match is a entailed graph under substitution.

I don't care about the subject allowing literals, as the text you quote does lay 
the ground work for later.  However, properties that are blank or literals are a 
much bigger step, not technically, but in architecture, as URI-named 
relationships are an important building block.  I'd like to take this step more 
consciously.

I have made a note in the editors' draft pending the review of the definitions



cwm allows bNodes and literals for properties (tested with cwm 1.0.0).  Is this 
used much?


	Andy

[*] http://lists.w3.org/Archives/Public/public-rdf-dawg/2004OctDec/0054.html
     (and a telecon IIRC).
Received on Monday, 22 November 2004 15:28:44 GMT

This archive was generated by hypermail 2.3.1 : Tuesday, 26 March 2013 16:15:21 GMT