Select Query Example (the dbRDF.rdf must be in the classpath)
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load tuprolog (java -jar sparql.jar -cp .), then
in the tuprolog environment type the following goals:

load_library('progetto.SPARQLLibrary').
setFilePath('dbRDF.rdf').
select [l] where { triple(var(s),uri('http://www.w3.org/2001/vcard-rdf/3.0#Family'),lit('Smith')) , triple(var(s),uri('http://www.w3.org/2001/vcard-rdf/3.0#Given'),var(l))}.



In the "tests" package you can find some test classes that are explanatory for the use of this library