Thanks, this is great stuff, although I kind of still get lost in the terms, being new to the whole LOD and semantic / ontology stuff.
Do any of you know any other good mailing list or forum with higher traffic to address more general questions, maybe not specific to DBpedia? Regards, Alex Em 09-09-2010 14:34, Kingsley Idehen escreveu: > >> > 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 >> > > ------------------------------------------------------------------------------ Automate Storage Tiering Simply Optimize IT performance and efficiency through flexible, powerful, automated storage tiering capabilities. View this brief to learn how you can reduce costs and improve performance. http://p.sf.net/sfu/dell-sfdev2dev _______________________________________________ Dbpedia-discussion mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
