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Corese is a Semantic Web Factory (triple store and SPARQL endpoint) implementing RDF, RDFS, SPARQL 1.1 Query and Update.

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#
# Given a RDF graph which contains a SPIN Query
# This query search the triples and return a string in turtle syntax
# Olivier Corby, Wimmics Inria I3S, 2013
#
prefix sp:       .
template {
  ?x " " ?p " "
  if (bound(?v), concat(":: ", ?v, " "), "")
   ?y " ."
}
where {
?in a sp:TriplePath ;
    sp:subject  ?x ; 
    sp:path ?p ; 
    sp:object   ?y 
    optional { ?in sp:pathVariable ?v }
}