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"""
SPARQL Update statements can be applied with :meth:`rdflib.graph.Graph.update`
"""
import rdflib
if __name__ == "__main__":
g = rdflib.Graph()
g.load("foaf.n3", format="n3")
print("Initially there are {} triples in the graph".format(len(g)))
g.update(
"""
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dbpedia: <http://dbpedia.org/resource/>
INSERT
{ ?s a dbpedia:Human . }
WHERE
{ ?s a foaf:Person . }
"""
)
print("After the UPDATE, there are {} triples in the graph".format(len(g)))
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