On Fri, 24 May 2002, Dave Beckett wrote: > >>>Jeremy Carroll said: > > Second a few questions. > > > > 1. Are there unattached nodes in an RDF graph? > > No; since we base our describe the rdf graph as triples > as node->arc->node rather than any other form. If this is not the > case then N-Triples in insufficient to connect the model theory and > syntax. > > > 2. Can any URI ref be a property name or must there be some associated > > namespace? > > Any URI ref. No, not _any_ URI ref. Some URI refs don't name properties. Arguably, all the phone: ones, all the mailto: ones, and a huge % of all the http:// URIrefs too. But I think I agree with (what I take to be) your general point. There are many URIrefs that we can take as naming URIrefs which aren't (for various reasons) going to have an RDF/XML document derferencable. However, the fact that they name RDF properties means that they can be used in RDF/XML instance data using the XML namespace mechanism, so in that sense they are associated with a namespace. Or they are a namespace. Or they can be written about using XML namespaces. This is pretty clear from M&S and we've mentioned this > a few times in passing with respect to the issues related to > writing them as qnames. > > (XML) Namespaces are artifacts of the RDF/XML serialization and are > not in the current model. Dan -- mailto:danbri@w3.org http://www.w3.org/People/DanBri/Received on Friday, 24 May 2002 06:24:33 EDT
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