W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > May 2003

RE: timbl-03 collection clutter

From: pat hayes <phayes@ai.uwf.edu>
Date: Wed, 7 May 2003 10:40:53 -0500
Message-Id: <p05210610baded96e1d66@[10.0.100.9]>
To: Brian McBride <bwm@hplb.hpl.hp.com>
Cc: w3c-rdfcore-wg@w3.org

>At 22:26 06/05/2003 +0100, Graham Klyne wrote:
>
>[...]
>
>>>Jeremy and Peter discussed the cost of relaxing that constraint,
>>>and it seems, to me, to be considerable: the details of the
>>>mapping of owl-dl-abstract-syntax to RDF graphs are somewhat
>>>subtle and impact many parts of the S&AS spec, especially
>>>the semantic layering bits.
>>>http://www.w3.org/2001/sw/WebOnt/webont-issues.html#I5.3-Semantic-Layering
>>
>>I'm a bit puzzled by this comment.  The mapping in AS&S 4.1 
>>describes how to convert OWL abstract syntax into triples.  What we 
>>are discussing is whether an RDF parser needs to generate these 
>>additional triples (which are in any case entailed in any 
>>RDFS-interpretation).  I don't see how the semantics of OWL 
>>abstract syntax can reasonably be dependent on the behaviour of an 
>>RDF parser.
>
>I would very much like to get this comment put to bed.
>
>Summarizing:
>
>
>So I'm confused.
>
>Are we all agreed that the only reason to keep the rdf:type rdf:List 
>triples would be if webont needed them?
>
>DanC: the cost of updating the Owl specs to not require the extra 
>type triples is 'considerable'.
>
>PatH: It bet its not.
>
>Jos: we can easily add/remove them as needed, so add them when needed.
>
>Jeremy: we can easily add/remove them as needed. Its more aesthetic 
>to remove them when not.
>
>So:------------
>
>PatH - you bet its trivial to change Owl not to need them - can you 
>propose specific text for the change?

Wherever any part of the OWL-XX syntactic conditions currently 
mention triples of the form

xxx rdf:type rdf:List

that reference is modified to refer to triples of the form

xxx rdf:first yyy
or
zzz rdf:rest xxx
or
xxx rdf:rest zzz

which could all be called 'list triples of xxx' or some such phrase. 
A minor edit to the text, no significant change to any actual 
conditions.

Pat
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Received on Wednesday, 7 May 2003 11:40:58 EDT

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