- From: Jan Grant <Jan.Grant@bristol.ac.uk>
- Date: Wed, 20 Nov 2002 17:27:56 +0000 (GMT)
- To: Brian McBride <bwm@hplb.hpl.hp.com>
- cc: pat hayes <phayes@ai.uwf.edu>, w3c-rdfcore-wg <w3c-rdfcore-wg@w3.org>
On Wed, 20 Nov 2002, Brian McBride wrote: > > At 10:42 20/11/2002 -0600, pat hayes wrote: > > [...] > > > >Oh, I thought that lang tags simply couldn't be attached to datatyped > >literals other than rdf:XMLLiterals, so this would be a syntax error. > >That's what the graph syntax rules seem to say. Is that wrong?? > > Well, I don't think its what they do say. I think its what they should > say, but that is not what the WG agreed. > > [...] > > > >It works but for a different reason. Perhaps I should spell this out more > >in the semantics doc. > > > >Making the denotation be something arbitrary in this case (ie not a > >literal value, but otherwise it could be anything) means that the ONLY > >entailment you can get is what you would get from basic graph > >interpretations, which is replacing the bad literal by a new bnode: > > Hmmm, are you saying that it does not entail the emtpy graph. I think I > wasn't clear; I'm trying to clarify precisely the test case proposed by > jan, non-well-formed-literal-2, in > > http://www.w3.org/2000/10/rdf-tests/rdfcore/datatypes/Manifest.rdf > > > The test case is (something like) > > <a> <b> "Arggggggg"^^xsd:integer . > > does not entail the empty graph. > > I think the MT says it does, but I'm appealing to you for confirmation. It turns out that it does, because "Arggggg"^^xsd:integer is given a denotation (even if it's a "spurious" one), and I don't think the woolly text in the TC WD is sufficient. Righto. It looks like the state of play is that the test cases for "duff" datatyped literals need a rethink, and I think I'm happier with why and how, now. Since Pat's given us a concrete "this is all you get" for the DT[xsd:integer]-closure from a duff datatyped literal, that's enough to rebuild those test cases. I'll sleep on it and come back tomorrow. -- jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/ Tel +44(0)117 9287088 Fax +44 (0)117 9287112 http://ioctl.org/jan/ ioctl(2): probably the coolest Unix system call in the world
Received on Wednesday, 20 November 2002 12:30:19 UTC