- From: Chris Bizer <chris@bizer.de>
- Date: Sat, 7 Jul 2007 14:43:39 +0200
- To: <www-tag@w3.org>, <semantic-web@w3.org>, "Linking Open Data" <linking-open-data@simile.mit.edu>
Hi all, Richard Cyganiak, Tom Heath and me are currently writing a tutorial on how to publish Linked Data [1] on the Web and ran into some terminology questions concerning Web Architecture. Here is the problem statement together with an example: Within the Linking Open Data community project [2] different data sources (URI owners) publish information about Tim Berners-Lee using different HTTP URIs: 1. DBpedia: http://dbpedia.org/resource/Tim_Berners-Lee 2. Hannover DBLP Server: http://dblp.l3s.de/d2r/resource/authors/Tim_Berners-Lee 3. Berlin DBLP Server: http://www4.wiwiss.fu-berlin.de/dblp/resource/person/100007 4. RDF Book Mashup: http://www4.wiwiss.fu-berlin.de/bookmashup/persons/Tim+Berners-Lee The first 3 data sources follow the W3C TAG "Dereferencing HTTP URIs" finding [3] and redirect via HTTP 303 to documents describing Tim Berners-Lee when the URIs are dereferenced over the Web. Therefore, the URIs identify Tim Berners-Lee as a non-information resource. This redirect also supports HTTP content negotiation and leads to HTML as well as RDF descriptions of Tim. 5. Tim also publishes a FOAF profile in which he assigns the URI http://www.w3.org/People/Berners-Lee/card#i to himself. Question 1: According to the terminology of the Architecture of the WWW document [4] are all these URIs aliases for the same non-information resource (our current view) or are they referring to different resources? Does the TAG finding "On Linking Alternative Representations To Enable Discovery And Publishing " [5] about generic and specific resources apply here, meaning that the URIs 1,2,3,5 refer to different specific non-information resources that are related to one generic non-information resource? Question 2: When the URIs are dreferenced they provide quite different information about Tim, which reflects the knowledge and the opinion of the specific URI owner about him. Within our tutorial we need to talk about this information and therefore need a term to refer to a concept that can be described as "information provided by a specific URI owner about a non-information resource", for example Tim. Depending on the answer to question 1, what would be the correct Web Architecture term to refer to this concept? Or is such a term missing? Question 3: Depending on the answer to question 1, is it correct to use owl:sameAs [6] to state that http://www.w3.org/People/Berners-Lee/card#i and http://dbpedia.org/resource/Tim_Berners-Lee refer to the same thing as it is done in Tim's profile. Any clarifications on these question would be highly welcomed. Cheers Chris [1] http://www.w3.org/DesignIssues/LinkedData.html [2] http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/LinkingOpenData [3] http://www.w3.org/2001/tag/doc/httpRange-14/2007-05-31/HttpRange-14 [4] http://www.w3.org/TR/webarch/ [5] http://www.w3.org/2001/tag/doc/alternatives-discovery.html [6] http://www.w3.org/TR/owl-ref/#sameAs-def -- Chris Bizer Freie Universität Berlin +49 30 838 54057 chris@bizer.de www.bizer.de
Received on Saturday, 7 July 2007 12:43:40 UTC