- From: Dave Beckett <dave.beckett@bristol.ac.uk>
- Date: Sun, 30 Mar 2003 23:51:42 +0100
- To: Yarden Katz <katz@underlevel.net>
- Cc: www-rdf-interest@w3.org, www-rdf-logic@w3.org
>>>Yarden Katz said: [Aside, this message probably didn't need cross posting ] > Hi, > > What are some approaches to assign MIME-types to certain RDF or DAML > resources? For example, consider the following: > > <daml:ObjectProperty rdf:ID="Picture"> > <rdfs:label>A Picture</rdfs:label> > <rdfs:comment>A cute picture class in DAML</rdfs:comment> > <rdfs:domain rdf:resource="#SomeObject"/> > <rdfs:range rdf:resource="#????"/> > </daml:ObjectProperty> I'm not familiar with the semantics of daml:ObjectProperty (or the OWL equivalent), however ... > An agent attempting to render RDF data has no way of knowing that > resources linked to using the above property are images and are to > be handled as such. How can these meaning be conveyed in RDF? The > obvious method seems to be to assign a MIME type such as > "image/jpeg" as the range of this property, but I do not know how > that can be expressed. Googling showed up a seemingly relevant link > "Mapping Between Content-Types (MIME types) and URIs" from > <http://rdfig.xmlhack.com/2001/05/09/2001-05-09.html> but it is > broken. Any ideas you may have on how to attach this elementary > problem would be great, whether involving usage of MIME or not. A quick google finds: Mapping between URIs and Internet Media Types TAG Finding 8 April 2002 (Revised 27 May 2002) http://www.w3.org/2001/tag/2002/01-uriMediaType-9 which is probably the best current description and set of ideas on this problem. The other way uses familiar and well deployed Dublin Core vocabulary an it's dc:format property. It takes as primary recommend value the IMT / MIME Type as a literal. You might be able to do some inference magic to imply that all your 'Picture's have the dc:format "image/jpeg". Otherwise you'd need to put it in the instance data. See http://dublincore.org/documents/1999/07/02/dces/ and many DC and RDF apps use this already. > > I have a second question that's related to the above: is there some > uniform way to note coordinates on an image (similar to an image > map) in RDF? For example, expressing something a long the lines of > "Instances of Object X should be placed in coordinate (X, Y)" The > most relevant link I found was: > <http://www.w3.org/2001/08/rdfweb/foafwho/imagemap/> but it does not > show an RDF representation of an image map, only the plain HTML one. Sorry, I've no info on this question. Dave
Received on Sunday, 30 March 2003 17:54:23 UTC