def check_statement(triple):
(s, p, o) = triple
if not (isinstance(s, URIRef) or isinstance(s, BNode)):
raise SubjectTypeError(s)
if not isinstance(p, URIRef):
raise PredicateTypeError(p)
if not (isinstance(o, URIRef) or isinstance(o, Literal) or isinstance(o, BNode)):
raise ObjectTypeError(o)
def check_pattern(triple):
(s, p, o) = triple
if s and not (isinstance(s, URIRef) or isinstance(s, BNode)):
raise SubjectTypeError(s)
if p and not isinstance(p, URIRef):
raise PredicateTypeError(p)
if o and not (isinstance(o, URIRef) or isinstance(o, Literal)
or isinstance(o, BNode)):
raise ObjectTypeError(o)
def check_predicate(p):
""" Test that p is a valid predicate identifier."""
if not isinstance(p, URIRef):
raise PredicateTypeError(p)