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"""
RDFLib has a [`Resource`][rdflib.resource.Resource] class, for a resource-centric API.
The [`Graph`][rdflib.Graph] class also has a `resource` function that can be used
to create resources and manipulate them by quickly adding or querying for triples
where this resource is the subject.
This example shows `g.resource()` in action.
"""
from rdflib import RDF, RDFS, Graph, Literal
from rdflib.namespace import FOAF
if __name__ == "__main__":
g = Graph()
# Create a Resource within graph g
bob = g.resource("http://example.com/bob")
# .set replaces all other values
bob.set(RDF.type, FOAF.Person)
bob.set(FOAF.name, Literal("Bob"))
bill = g.resource("http://example.com/bill")
# .add adds to existing values
bill.add(RDF.type, FOAF.Person)
bill.add(RDF.type, FOAF.Agent)
bill.set(RDFS.label, Literal("Bill"))
bill.add(FOAF.knows, bob)
# Resources returned when querying are 'auto-boxed' as resources:
print(f"Bill knows: {bill.value(FOAF.knows).value(FOAF.name)}")
# Slicing ([] syntax) can also be used:
for friend in bill[FOAF.knows]:
print(f"Bill knows: {next(friend[FOAF.name])}")
# Or even quicker with paths:
for friend in bill[FOAF.knows / FOAF.name]:
print(f"Bill knows: {friend}")
# Setting single properties is also possible:
bill[RDFS.label] = Literal("William")
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