DBpedia receives shot #1 of CLASSiness vaccine

DBpedia receives shot #1 of CLASSiness vaccinehttp://www.openlinksw.com:443/blog/kidehen@openlinksw.com/blog/?id=1372 The current live instance of DBpedia has just received dose #1 of a series of planned "Context" oriented booster shots. These shots seek to to protect DBpedia from contextual incoherence as it grows in data set expanse and popularity. Dose #1 (vaccine label: Yago) equips DBpedia with a functional (albeit non exclusive) Data Dictionary component courtesy of the Yago Class Hierarchy . When the DBpedia & Yago integration took place last year (around WWW2007, Banff) there was a little, but costly omission that occurred: nobody sought to load the Yago Class Hierarchy into the Virtuoso's Inference Engine :-( Anyway, the Class Hierarchy has now been loaded into the Virtuoso's inference engine (as Virtuoso Inference Rules) and the following queries are now feasible using the live Virtuoso based DBpedia instance hosted by OpenLink Software: -- Find all Fiction Books associated with a property "dbpedia:name" that has literal value: "The Lord of the Rings" . DEFINE input:inference "http://dbpedia.org/resource/inference/rules/yago#" PREFIX rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; PREFIX dbpedia: &lt;http://dbpedia.org/property&gt; PREFIX yago: &lt;http://dbpedia.org/class/yago&gt;&nbsp; SELECT DISTINCT ?s FROM < xmlns="http" dbpedia.org="dbpedia.org">//dbpedia.org> WHERE { ?s a yago:Fiction106367107 . ?s dbpedia:name "The Lord of the Rings"@en . } -- Variant of query with Virtuoso's Full Text Index extension via the bif:contains function/magic predicate DEFINE input:inference "http://dbpedia.org/resource/inference/rules/yago#" PREFIX rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; PREFIX dbpedia: &lt;http://dbpedia.org/property&gt; PREFIX yago: &lt;http://dbpedia.org/class/yago&gt;&nbsp; SELECT DISTINCT ?s ?n FROM < xmlns="http" dbpedia.org="dbpedia.org">//dbpedia.org> WHERE { ?s a yago:Fiction106367107 . ?s dbpedia:name ?n . ?n bif:contains 'Lord and Rings' } -- Retrieve all individuals instances of Fiction Class which should include all Books. DEFINE input:inference "http://dbpedia.org/resource/inference/rules/yago#" PREFIX rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; PREFIX dbpedia: &lt;http://dbpedia.org/property&gt; PREFIX yago: &lt;http://dbpedia.org/class/yago&gt;&nbsp; SELECT DISTINCT ?s FROM < xmlns="http" dbpedia.org="dbpedia.org">//dbpedia.org> WHERE { ?s a yago:Fiction106367107 . } LIMIT 50 Note: you can also move the inference pragmas to the Virtuoso Sever side i.e place the inference rules in a server instance config file, thereby negating the need to place "define input:inference 'http://dbpedia.org/resource/inference/rules/yago#'" pragmas directly in your SPARQL queries. Related Mike's UMBEL: Making Linked Data Classypost Fred's announcement about the Yago revamp en route to UMBEL Expanding Data Object Domains via UMBEL My Prior posts about UMBEL Thu, 05 Jun 2008 17:11:34 GMTVirtuoso Universal Server 08.03.3334Kingsley Uyi IdehenDBpedia receives shot #1 of CLASSiness vaccinehttp://www.openlinksw.com:443/weblog/public/images/vbloglogo.gifhttp://www.openlinksw.com:443/blog/kidehen@openlinksw.com/blog/?id=1372I have seen the future and it's full of Linked Data! :-)8831 Matteohttp://www.openlinksw.com:443/blog/kidehen@openlinksw.com/blog/?id=1372#4694http://www.openlinksw.com:443/blog/kidehen@openlinksw.com/blog/?id=1372#4694moxol8@hotmail.comMon, 12 Jul 2010 11:31:00 GMT<p><br /> Hi Kingsley,</p><br /> <p><br /> I know this post is a bit outdated, but I was wondering if it is still possible to send this kind of queries on the dbpedia sparql endpoint, since i tried with your first example but had no luck.</p><br /> <p><br /> Thanks,</p><br /> <p><br /> Matteo</p><br /> <p><br /> http://twitter.com/matteomoci</p>