On Wed, 01 Sep 2004 16:51:46 -0400, Stefano Mazzocchi <[EMAIL PROTECTED]> wrote:
> Anyway, rdf:about indicates the subject while rdfs:seeAlso indicates an > implicit relationship. > > I personally strongly dislike rdf:seeAlso for that: it doesn't state > what kind of relationship you have with that URI, it's vague and > semantically useless. True, but it's pragmatically useful. An explicit property: X y:property http://somewhere.org gives you proper semantics. But it doesn't (by itself) tell you anything about what if anything you get if do a HTTP GET on the. Strictly speaking neither does seeAlso, but people are tending to put retrievable RDF documents at the end, so it makes a useful hint. Note that there's nothing to stop there being *more* information: X rdfs:seeAlso http://somewhere.org X y:property http://somewhere.org http://somewhere.org rdf:type foaf:Document > In general, I don't like a lot of RDFSchema and I think that OWL Light > (or even a subset of that, OWL Tiny as some people call it) is a lot > mroe coherent than RDFSchema, but that's just me. Hmm - you are using a DL reasoner? > >>>1.3) How do we define a URI to represent a long lived (yet varying) > >>>entity? > >> > >>eheh, great question ;-) > >>]] > >> > >>Easy! My home page is http://dannyayers.com. The representations of it > >>(the HTML & RSS) vary a lot, but conceptually it's the same entity. > > Easy?!? c'mon. Easy to implement so that you show something? sure. Easy > to implement so that the semantic web can really happen? another story. > Ask the TAG ;-) TimBL seems reasonably happy ;-) > > But how can I tell you things about how it looked yesterday or last week? > > exactly. As a hack, if you have a date-based URI, you can "infer" that > if you have > > http://blah/newsfeed/2004/03/23 > > then you can ask for > > http://blah/newsfeed/2003/03/23 > > and get the news of the same day last year. But there is no guarantee > that this is so. Quite. Yet if the information is made explicit in RDF statements, you can be (more) sure. > Also, > > http://blah/newsfeed > > might return you the "last" feed, but then you have no idea on how to > ask for a previous feed. > > The RDF data access WG is supposed to solve this issue, tough, but I > suspect that a clear result won't be found, it will just emerge out of > de-facto useful practices. On that you're probably right. But if anyone's going to pull rabbits out of hats it's those guys. > I think the ASF *should* start to centralize these things and associate > persistent URIs to projects. I can push this at the board@ level if > required. Ooh, the word 'centralize' is a little worrying. What if the project moves somewhere else? Are projects really that persistent? (Maybe, I don't know). Cheers, Danny. -- http://dannyayers.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
