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RE: Languageless Typed Literals

From: <Patrick.Stickler@nokia.com>
Date: Tue, 6 May 2003 16:28:39 +0300
Message-ID: <A03E60B17132A84F9B4BB5EEDE57957B01B90D7C@trebe006.europe.nokia.com>
To: <phayes@ai.uwf.edu>, <jjc@hplb.hpl.hp.com>
Cc: <w3c-rdfcore-wg@w3.org>



Pat,

Can we take that as support for Option 1?

Patrick


> -----Original Message-----
> From: ext pat hayes [mailto:phayes@ai.uwf.edu]
> Sent: 05 May, 2003 23:02
> To: Jeremy Carroll
> Cc: Stickler Patrick (NMP/Tampere); w3c-rdfcore-wg@w3.org
> Subject: RE: Languageless Typed Literals
> 
> 
> >Jeremy:
> >>  Option 1:
> >>  XMLLiteral ceases to be a typed literal but we revert to the old
> >>  treatment  where it was simply a special.
> >
> >
> >Patrick:
> >>  My strong preference is then for option 1, reverting (in a sense)
> >>  XML literals to the M&S definition.
> >>
> >>  This has the additional benefit that lexical forms can be left
> >>  as-is in the graph per the RDF/XML serialization and only need be
> >>  canonicalized when testing for equality.
> >>
> >>  Thus, plain and XML literals both may take lang tags and neither
> >>  are typed literals nor fall within the scope of RDF datatyping.
> >>
> >>  Typed literals do not take lang tags, period.
> >>
> >>  This avoids all the headaches relating to the bizzare datatype
> >>  rdf:XMLLiteral.
> >>
> >>  Patrick
> >>
> >>
> >
> >The old treatment was in say:
> >http://www.w3.org/TR/2002/WD-rdf-concepts-20020829/
> >
> >I think that the reagle issue resolutions would in the main 
> stay, and the
> >canonicalization would still be specified in the syntax, but with the
> >implementation note that makes it clear that they "only **need** be
> >canonicalized when testing for equality."
> >
> >I have three concerns about this option:
> >
> >a) we had comments
> >http://lists.w3.org/Archives/Public/www-rdf-comments/2002JulS
ep/0092.html
>linking to
>http://www.w3.org/2002/07/29-rdfcadm-tbl.html#xtocid103643
>
>and
>
>http://lists.w3.org/Archives/Public/www-rdf-comments/2002JulSep/0165.html
>
>both of which would need resurrecting, since we have followed up saying that
>we have changed in the way they sort of wanted.
>
>
>b) how difficult would it be for Pat to go back and rework

Not very difficult.  I am ready for almost any decision we make, I 
think. I have the relevant changes scoped out for them all, and will 
do the edits once we decide.

But...

>
>c) impact on OWL support for XML Literals - webont are generally negative
>about them, the more work they have to do, the less support there will be in
>OWL for these.

...right. BUt then, Webont are free to rule out this part of RDF from 
OWL, and take the resulting heat from their user community.

I think it would be easier for OWL if it were presented with XML 
literals as a distinct syntactic category, since that would enable 
them to deny equality substitution inside XML literals without 
compromising their semantics.

Pat
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Received on Tuesday, 6 May 2003 09:28:43 EDT

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