sparql - semantic web + linked data integration -

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i'm new semantic web. i'm trying sample application can query data different data sources in 1 query. have created small rdf file contains references dbpedia resources defining localities. question : how can data contained in file , other information in description of distant resource (for example : name of person local file, , total poulation in city dbpedia-owl:populationtotal distant rdf file). don't understand sparql query language, tried use jena arq api service keyword doesn't solve problem. please?

i guess looking semantic web client library, tries leverage ggg. albeit, standard exploration algorithm of framework follows rdfs:seealso links. nevertheless, general approach seems looking for, i.e., create local graph consists of seed graph , traverse relations level, e.g., 3 steps, resolves uris , load content local triple. utilising advanced technologies sparql federation might later ;)


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