When writing an ontology, there are several very commonly used types, including: DatatypeProperty ObjectProperty FunctionalProperty InverseFunctionalProperty The first three kinda look like the...

I am trying to write a SPARQL query which should give me all foaf:Agents which aren't foaf:Persons. I can't see a way to apply this OPTIONAL/BOUND construct to this problem, because all the proper...

I know this sounds like a very stupid question, but I've been trying to figure this out and I can't find anything on this, though it seems obvious that this should be doable. I'm developing someth...

As shown in this question which has a similar title, I would like to retrieve a dbpedia resource by knowing a part of its name. I'm a beginner when it comes to SPARQL and such, but the example in t...

I wrote a script to export twitter friends as foaf rdf description. Now I'm looking for a tool to visualize the friend networks. I tried http://foafscape.berlios.de/ but for 300+ Nodes it is really...

I am trying to get the resource describing country Romania by the country name with this query: PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX : <http://dbpedia.org/resource/> SELEC...

I'm looking to use SPARQL for a relatively basic task: Given a FOAF graph, I'd like to parse the elements I find in there, get their tags (if they exist) and then, use those as new graphs from whic...