Dereferencing a URI vs querying a SPARQL endpoint

[Daniel Schwabe]

Dear all, while designing Explorator [1], where one can explore one or more triple repositories that provide SPARQL enpoints (as well as direct URI dereferencing), I found the following question, to which I don't really know the answer... For the sake of this discussion, I'm considering only such sites, i.e., those that provide SPRQL enpoints. For a given URI r, is there any relation between the triples I get when I dereference it directly, as opposed to  querying the SPARQL enpoint for all triples <r, ?p, ?o> ?  Should there be (I could also get <?s, ?p, r>, for example) ? For sites such as dbpedia I believe that I get the same set of triples. But I believe this is not a general behavior. Should there be a good practice about this for LoD sites that provide SPARQL endpoints? At the very least, perhaps this could also be described in the semantic sitemap.xml, no? Cheers D [1] http://www.tecweb.inf.puc-rio.br/explorator -- Daniel Schwabe Tel:+55-21-3527 1500 r. 4356 Fax: +55-21-3527 1530 http://www.inf.puc-rio.br/~dschwabe Dept. de Informatica, PUC-Rio R. M. de S. Vicente, 225 Rio de Janeiro, RJ 22453-900, Brasil