import logging

# Configure how we want rdflib logger to log messages
_logger = logging.getLogger("rdflib")
_logger.setLevel(logging.DEBUG)
_hdlr = logging.StreamHandler()
_hdlr.setFormatter(logging.Formatter('%(name)s %(levelname)s: %(message)s'))
_logger.addHandler(_hdlr)

from rdflib.graph import Graph
from rdflib import URIRef, Literal, BNode, Namespace
from rdflib import RDF

store = Graph()

# Bind a few prefix, namespace pairs.
store.bind("dc", "http://http://purl.org/dc/elements/1.1/")
store.bind("foaf", "http://xmlns.com/foaf/0.1/")

# Create a namespace object for the Friend of a friend namespace.
FOAF = Namespace("http://xmlns.com/foaf/0.1/")

# Create an identifier to use as the subject for Donna.
donna = BNode()

# Add triples using store's add method.
store.add((donna, RDF.type, FOAF["Person"]))
store.add((donna, FOAF["nick"], Literal("donna", lang="foo")))
store.add((donna, FOAF["name"], Literal("Donna Fales")))

# Iterate over triples in store and print them out.
print("--- printing raw triples ---")
for s, p, o in store:
    print((s, p, o))

# For each foaf:Person in the store print out its mbox property.
print("--- printing mboxes ---")
for person in store.subjects(RDF.type, FOAF["Person"]):
    for mbox in store.objects(person, FOAF["mbox"]):
        print(mbox)

# Serialize the store as RDF/XML to the file foaf.rdf.
# store.serialize("foaf.rdf", format="pretty-xml", max_depth=3)

# Let's show off the serializers

print("RDF Serializations:")

# Serialize as XML
print("--- start: rdf-xml ---")
print(store.serialize(format="pretty-xml"))
print("--- end: rdf-xml ---\n")

# Serialize as NTriples
print("--- start: ntriples ---")
print(store.serialize(format="nt"))
print("--- end: ntriples ---\n")
