- From: Aaron Swartz <aswartz@swartzfam.com>
- Date: Mon, 04 Jun 2001 23:59:07 -0500
- To: RDF Interest <www-rdf-interest@w3.org>
- CC: Douglas Campbell <Douglas.Campbell@natlib.govt.nz>
I'm forwarding this message on behalf of Douglas. Please keep him in the CC list of any responses, as he is not on the list. - [ Aaron Swartz | me@aaronsw.com | http://www.aaronsw.com ] I've had a look at RDFFilter and SiRPAC (and a couple of others on Dave Beckett's list) and yes it's easy to get the tuples. It's what to do with tuples that's harder. My aim is to extract the DC, DCQ, and possibly other non-DC elements so I can put them in a database and make them searchable. This means navigating through the generated tuples recombining them back into "useful" chunks of data. Some of the grey areas for me: - When re-combining tuples, how can I be sure which predicate is an RDF value and which is a dc:title, etc. etc. - if other namespaces were used for predicates instead of "http://www.w3.org/1999/02/22-rdf-syntax-ns#value" and "http://purl.org/dc/elements/1.1/title" etc. I'd miss them altogether. - I haven't worked through the Dumb-Down algorithm in "Expressing Qualified Dublin Core in RDF" in detail but it looks like it only dumbs down to Simple DC, not bare Qualified DC. - I haven't quite worked out how to incorporate RDF schema lookups in the Java tools yet :-( - I'm a tad confused which RDF tool I should use anyway - from what I can gather there are a number of proposals for an RDF API (namely Jena and SiRPAC) but no consensus yet, and SiRPAC has 2 flavours - the W3C download or the Stanford download. I know there should never be only one choice for a tool, but it's useful to know which are popular and which have a compatibility future - I chose SiRPAC as DCMI's "EOR (Extensible Open Rdf) Toolkit" seem to use it. DC/DCQ is easier, RDF is richer, but it's a big leap of faith to RDF - eg. if I dumb it back down to DC/DCQ I'll probably loose data, but to keep the full RDF richness, I suppose I'd really need to move to an RDF-aware database system [which seems unjustified as at this stage I haven't encountered any RDF yet in my pilot DC crawls of the New Zealand domain]. Does anyone know of any [Java] RDF tools which a. are DC/DCQ aware and/or b. lookup RDF schemas or c. incorporate the Dumb Down algorithm. Thanx, Douglas Campbell National Library of New Zealand
Received on Tuesday, 5 June 2001 00:59:18 UTC