- From: Graham Klyne <Graham.Klyne@Baltimore.com>
- Date: Sat, 16 Jun 2001 21:13:48 +0100
- To: Sergey Melnik <melnik@db.stanford.edu>
- Cc: w3c-rdfcore-wg@w3.org
Sergey, I vaguely remember this being raised, and must say I have deep reservations about that approach. Right now I cannot say exactly why I think this is a problem, and I won't fight the case here, other than to note that I might object later if/when I can crystalize my concerns. (Part of my objection is that any mechanism that is based on merely statistical uniqueness (i.e. digest-based) has no place in the core of the RDF framework. In an appendix to RFC 2938, I have calculated some probabilities of collision using MD5; the numbers of digest values in use does not need to be astronomically large (c. 10^18 or so) before the probability of collision becomes quite significant. Applications may choose to take such statistical chances, but I don't think a fundamental technology framework like RDF should do so.) #g -- At 06:58 PM 6/15/01 -0700, Sergey Melnik wrote: > > do you really mean this last claim? > > I suspect you meant that all parsers should assign a predictable genid > > given a common RDF/XML description mentioning a resource. 'all parsers > > should assign the same genid to the same resource' would be magic, since > > many times parsers won't have that information accessible. > >Dan, > >just to provide a pointer, a whole while ago I proposed an algorithm for >doing exacty that "magic". A summary of the proposal can be found at >http://nestroy.wi-inf.uni-essen.de/rdf/sum_rdf_api/ under "URI >generation for anonymous resources" (by Peter Hannappel and Reinhold >Klapsing). I believe, if needed, this algorithm can be tweaked to >eliminated the problems wrt using XOR (as pointed out by Brian long >ago). ------------------------------------------------------------ Graham Klyne Baltimore Technologies Strategic Research Content Security Group <Graham.Klyne@Baltimore.com> <http://www.mimesweeper.com> <http://www.baltimore.com> ------------------------------------------------------------
Received on Saturday, 16 June 2001 16:20:19 UTC