def literal_rdf_representation(literal):
value = str(literal.value) if literal.value else literal
if literal.langtag:
# a language tag can only go with prov:InternationalizedString
return RDFLiteral(value, lang=str(literal.langtag))
else:
datatype = literal.datatype
if "base64Binary" in datatype.uri:
value = literal.value.encode()
return RDFLiteral(value, datatype=datatype.uri)
def literal_rdf_representation(literal):
value = six.text_type(literal.value) if literal.value else literal
if literal.langtag:
# a language tag can only go with prov:InternationalizedString
return RDFLiteral(value, lang=str(literal.langtag))
else:
datatype = literal.datatype
if 'base64Binary' in datatype.uri:
if six.PY2:
value = base64.standard_b64encode(value)
else:
value = literal.value.encode()
return RDFLiteral(value, datatype=datatype.uri)
def encode_rdf_representation(self, value):
if isinstance(value, URIRef):
return value
elif isinstance(value, pm.Literal):
return literal_rdf_representation(value)
elif isinstance(value, datetime.datetime):
return RDFLiteral(value.isoformat(), datatype=XSD['dateTime'])
elif isinstance(value, pm.QualifiedName):
return URIRef(value.uri)
elif isinstance(value, pm.Identifier):
return RDFLiteral(value.uri, datatype=XSD['anyURI'])
elif type(value) in LITERAL_XSDTYPE_MAP:
return RDFLiteral(value, datatype=LITERAL_XSDTYPE_MAP[type(value)])
else:
return RDFLiteral(value)
def to_rdf(self, g: Graph, emit_type_arc: bool = False) -> BNode:
# _:x rdf:type owl:Restriction .
# _:x owl:onProperty T(OPE) .
# _:x owl:hasSelf "true"^^xsd:boolean .
x = BNode()
g.add((x, RDF.type, OWL.Restriction))
g.add((x, OWL.onProperty, self.objectPropertyExpression.to_rdf(g)))
g.add((x, OWL.hasSelf, RDFLiteral(True)))
return x
def to_rdf(self, g: Graph) -> BNode:
"""
_:x rdf:type owl:Restriction .
_:x owl:onProperty T(OPE) .
_:x owl:hasSelf "true"^^xsd:boolean .
:param g: the RDF graph
:return: a BNode
"""
rval = BNode()
g.add((rval, RDF.type, OWL.Restriction))
g.add((rval, OWL.onProperty, self.objectPropertyExpression.to_rdf(g)))
g.add((rval, OWL.hasSelf, RDFLiteral(True)))
return rval