On 7/14/14 10:30 AM, Csaba Veres wrote:
Hi,I have an issue with discrepancies found when querying DBPedia in different ways. For example, select ?s, ?p, ?p1, ?o where { { <http://dbpedia.org/resource/Camille_Saint-Saëns> ?p ?o } UNION { ?s ?p1 <http://dbpedia.org/resource/Camille_Saint-Saëns> } } at dbpedia.org/sparql returns a large number of “sameAs” results, nothing else. The same query at live.dbpedia.org returns nothing. Yet the URL http://dbpedia.org/resource/Camille_Saint-Saëns is mapped to http://dbpedia.org/page/Camille_Saint-Saëns which returns a lot pf useful information. Where are the missing triples at the SPARQL endpoints?
The following endpoints provide you with access to DBpedia datasets, in varying degrees i.e., they don't load identical datasets and their servers are configured differently, due to the fact they are hosted on different machines -- with varying computing capacity. In ascending computing resource capacity, you have the following:
1. http://dbpedia.org/sparql 2. http://live.dpbedia.org/sparql 3 http://dbpedia-live.openlinksw.com/sparql 4. http://lod.openlinksw.com/sparql -- LOD cloud cache .As all of the above are Virtuoso based, you can share SPARQL protocol URLs when trying to diagnose issues. You can even change the cname (host and domain) parts of the URLs to see how the same query is handled across the different endpoints etc..
Kingsley
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------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck® Code Sight™ - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds
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