from rdflib import Graph, Literal, BNode, RDF
from rdflib.namespace import FOAF, DC

if __name__=='__main__':

    store = Graph()

    # Bind a few prefix, namespace pairs for pretty output
    store.bind("dc", DC)
    store.bind("foaf", FOAF)

    # 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 donna_foaf.rdf.
    store.serialize("donna_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 Turtle
    print "--- start: turtle ---"
    print store.serialize(format="turtle")
    print "--- end: turtle ---\n"

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