> > Question 4: Is there any kind of inference going on when retrieving > > things from DBpedia so I can asume some things? (for example, that all > > writers are also persons, etc) Is there a way to refine this rules to > > add support for better inferences or better awareness of cross-onthology > > classification? In the portuguese case, it seems to me easier if there > > is way to say "all the things being skos:subject > > <http://dbpedia.org/resource/Category:Portuguese_writers> are also > > dbpedia-owl:Writer" than to try to edit one by one the articles so they > > end up being explicitly dbpedia-owl:Writer . > > Responding to myself, I found this on the matter of inference/reasoning > and categories: > > http://stackoverflow.com/questions/3300191/sparql-skosbroader-help > > Haven't tried that yet, but I hope there is (or there will be) a more > concise way of achieving the same.
Inference is performed in backward-chaining fashion and optional. The DBpedia linksets are sometimes derived from a forward-chaining inference workflow. > Still wondering if there is *ANY* inference going on in the process of > quering DBpedia, and (if any) who and when it is done (when quering in > the rdf store, when mapping wikipedia so it all becomes explicit and > later there is no need for inference, etc). Only if inference context is enabled which is done by specifically using SPARQL pragmas to apply inference rules to SPARQL patterns. There are some pre-configured inference rules associated with the DBpedia instance which are visible via the interface at: http://dbpedia.org/fct . When you get the description of an entity, you can use "Settings" to select inference rules from a drop-down etc.. The inference rules names can also be used in your Virtuoso SPARQL Query pragmas. Links: 1. http://virtuoso.openlinksw.com/presentations/SPARQL_Tutorials/SPARQL_Tutorials_Part_2/SPARQL_Tutorials_Part_2.html -- Virtuoso SPARQL Tutorial with Inference Rules Coverage 2. http://virtuoso.openlinksw.com/presentations/SPARQL_Tutorials/SPARQL_Tutorials_Part_2/SPARQL_Tutorials_Part_2.html#(41) -- SKOS example . > ------------------------------------------------------------------------------ > This SF.net Dev2Dev email is sponsored by: > > Show off your parallel programming skills. > Enter the Intel(R) Threading Challenge 2010. > http://p.sf.net/sfu/intel-thread-sfd > _______________________________________________ > Dbpedia-discussion mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion > -- Regards, Kingsley Idehen President& CEO OpenLink Software Web: http://www.openlinksw.com Weblog: http://www.openlinksw.com/blog/~kidehen Twitter/Identi.ca: kidehen ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Dbpedia-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
