In this paper we present a tool to syntactically and seman-
tically validate SPARQL queries. With this aim, we extract
triple patterns and filter conditions from SPARQL queries
and we use the OWL API and an OWL ontology reasoner in
order to detect wrong expressions. Given an ontology and
a query, the tool reports different kinds of programming er-
rors: wrong use of vocabulary, wrong use of resources and
literals, wrong filter conditions and wrong use of variables
in triple patterns and filter conditions. When the OWL on-
tology reasoner is used the tool reports a diagnosis.
