- From: Jan Grant <Jan.Grant@bristol.ac.uk>
- Date: 2002年11月28日 17:25:43 +0000 (GMT)
- To: "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
- cc: bwm@hplb.hpl.hp.com, www-rdf-comments <www-rdf-comments@w3.org>
- Message-ID: <Pine.GSO.4.44.0211281716180.12073-100000@mail.ilrt.bris.ac.uk>
On 2002年11月28日, Peter F. Patel-Schneider wrote: > > From: Brian McBride <bwm@hplb.hpl.hp.com> > Subject: Re: problem with blank node identifiers and rdf:nodeID > Date: 2002年11月28日 17:01:01 +0000 > > > At 10:55 28/11/2002 -0500, Peter F. Patel-Schneider wrote: > > > > >It appears to me that the use of rdf:nodeID makes it impossible to > > >correctly transform an RDF/XML document into n-triples without first > > >checking for all the rdf:nodeID uses in the document. Otherwise a > > >generated blank node id could accidentally be the same as one used (later) > > >in an rdf:nodeID in the document. > > > > Is there anywhere in the spec where it says that the node id used in the > > n-triples MUST be the same as the nodeID used in the rdf/xml? > > > > Brian > > As indicated in my response to Jan, I believe that the spec explicitly > requires that the node id in the triple is the same as in the RDF/XML. There are words that might give that impression here: http://www.w3.org/TR/2002/WD-rdf-syntax-grammar-20021108/#nodeElement However, that section also links to http://www.w3.org/TR/rdf-concepts/#dfn-blank-node-id which gives a good definition for blank nodes. The section also uses the text, "generate a blank node identifier" without making explicit the need for a disambiguation step so that generated ids are distinct from ids used in the document. Reading section 2.3.2 of the concepts document, I think it is clear that a simple "name mangling" function such as I suggested is sufficient to generate a correct transformation to N-Triples. Nevertheless, the syntax spec needs some words to catch this: [[ If e.subject is empty, generate a Blank Node Identifier i and ... ]] so that the space of generated identifiers and ids supplied by rdf:nodeID are clearly distinct. -- 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/ New Freedom of Information Act: theirs, to yours. Happy now?
Received on Thursday, 28 November 2002 12:26:55 UTC