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"""
SPARQL Queries be prepared (i.e parsed and translated to SPARQL algebra)
by the :meth:`rdflib.plugins.sparql.prepareQuery` method.
When executing, variables can be bound with the
``initBindings`` keyword parameter
"""
import rdflib
from rdflib.plugins.sparql import prepareQuery
from rdflib.namespace import FOAF
if __name__=='__main__':
q = prepareQuery(
'SELECT ?s WHERE { ?person foaf:knows ?s .}',
initNs = { "foaf": FOAF })
g = rdflib.Graph()
g.load("foaf.rdf")
tim = rdflib.URIRef("http://www.w3.org/People/Berners-Lee/card#i")
for row in g.query(q, initBindings={'person': tim}):
print row
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