foaf

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 which to find information about those people. So for instance, you could imagine a simple use case where I want to run a SPARQL query to list all of my favorite foods (as per my FOAF file), and also the favorite foods of all my friends. Here is what this looks like at the moment. Note that for testing purposes, at the moment all I'm trying to do with the query below is fetch the name of the friend,

When writing an ontology, there are several very commonly used types, including: DatatypeProperty ObjectProperty FunctionalProperty InverseFunctionalProperty The first three kinda look like they'd be used in a particular set of ways, but I find my idea of them being challenged by how I've seen them used in FOAF. When should each of them be used or not be used? Joshua Taylor The first two of these, DatatypeProperty and ObjectProperty, describe what kind of values a triple with the property should have. Datatype properties relate individuals to literal data (e.g., strings, numbers, datetypes,

I'm trying to extract entity dictionary contains person name etc. from dbpedia using sparql. PREFIX owl: <http://dbpedia.org/ontology/> PREFIX dbpprop: <http://dbpedia.org/property/> SELECT ?name WHERE { ?person a owl:Person . ?person dbpprop:name ?name . FILTER(lang(?name) = "en") } The query above did succeed, but when I change the language name to fr , there is nothing to fetch. How can I fetch names in other languages? Moreover, why can't I filter language using query below? SELECT ?name WHERE { ?person a owl:Person . ?person dbpprop:language "English" ?person dbpprop:name ?name . } //