- From: Pat Hayes <phayes@ihmc.us>
- Date: Tue, 25 Sep 2007 20:49:51 -0500
- To: "Nick Gall" <nick.gall@gmail.com>
- Cc: www-tag@w3.org
>It's 2:30am in London where I write this, just having read the >umpteenth post about Cool URIs, so I may just be halucinating. But >it struck me when thinking about the things that a URI can't >identify that AFAIK a URI can't identify a URI. Is this true? If so, >is it important? I don't think it is true, because a URI can in principle identi...no, refer to, anything at all. Now, however, that said, I don't see any way to actually 'attach' a URI to another URI, as it were, in the way that it can be attached to a Web page, say. But again, we have other ways to refer to URIs: for example, XML schema has the anyURI datatype, so you could use a typed literal in RDF to refer to a URI. So why use a URI to do it? >It could be important because without a way to identify a URI, one >cannot make (RDF) assertions it. Technically, RDF doesn't allow a literal to be a subject, but that is clearly a bug and is often ignored by modern RDF tools. So ignoring it, you could use this to make assertions about a URI. > For example, given the http URI > >[1] ><http://ironick.typepad.com/ironick/2007/09/three-kinds-of-.html>http://ironick.typepad.com/ironick/2007/09/three-kinds-of-.html > >one might want to assert that it "ends with the letters h,t,m,l" or >that it is so many characters long. "<http://ironick.typepad.com/ironick/2007/09/three-kinds-of-.html>http://ironick.typepad.com/ironick/2007/09/three-kinds-of-.html"^^xsd:anyURI mydef:hasLength "65"^^xsd:number . ?? Pat -- --------------------------------------------------------------------- IHMC (850)434 8903 or (650)494 3973 home 40 South Alcaniz St. (850)202 4416 office Pensacola (850)202 4440 fax FL 32502 (850)291 0667 cell phayesAT-SIGNihmc.us http://www.ihmc.us/users/phayes
Received on Wednesday, 26 September 2007 01:50:07 UTC