- From: Thomas Baker <thomas.baker@bi.fhg.de>
- Date: Sun, 27 Feb 2005 19:08:38 +0100
- To: Benjamin Nowack <bnowack@appmosphere.com>
- Cc: "Miles, AJ (Alistair)" <A.J.Miles@rl.ac.uk>, public-esw-thes@w3.org
On Fri, Feb 25, 2005 at 06:28:15PM +0100, Benjamin Nowack wrote: > >In the course of untangling these issues, we have ended > >up in the DCMI Usage Board with a bias against building > >implementation-related restrictions into the very definitions > >of the vocabulary. Limiting values to literals, for example, > >can perhaps more appropriately be done in some sort of > >application-profile construct rather than "once and for all" > >in the canonical representation of the vocabulary. .. > ...would you > actually encourage vocab developers to invent hybrid > properties (yep, by "hybrid" I meant plain rdf:Properties > which don't constrain their range to either literals or > non-literals)? I guess that'll be another "it depends" > answer ;) Benjamin, I'm not familiar with the notion of hybrid properties in the RDF context, so I may not be correctly understanding your point... The RDF schema in which http://purl.org/dc/elements/1.1/creator (for example) is defined essentially says that Creator is an RDF property, with a label, comment (definition), and description. In practice, RDF users have since 1997 been using dc:creator for arcs that point either to a string or to a node (i.e., resource) with its own properties (the latter has sometimes been called a "structured value"). Does this make Creator a "hybrid" property? It is true that differences between encoding styles have created some difficulties -- see, for example, [1]. Are you suggesting that the formal declaration of the terms in RDF be more explicit in this regard? Tom P.S. I will be traveling and may not be able to follow up on this thread until March 9... [1] http://www.ukoln.ac.uk/metadata/dcmi/rdf-values/ -- Dr. Thomas Baker Thomas.Baker@izb.fraunhofer.de Institutszentrum Schloss Birlinghoven mobile +49-160-9664-2129 Fraunhofer-Gesellschaft work +49-30-8109-9027 53754 Sankt Augustin, Germany fax +49-2241-144-2352 Personal email: thbaker79@alumni.amherst.edu
Received on Sunday, 27 February 2005 18:05:51 UTC