from rdflib import Graph, URIRef, Literal

g = Graph()
result = g.parse("http://www.w3.org/2000/10/swap/test/meet/blue.rdf")
    
print("graph has %s statements." % len(g))
for s, p, o in g:
   if (s, p, o) not in g:
    
    s = g.serialize(format='nt')
sorted(g) == [ 
    (URIRef(u'http://meetings.example.com/cal#m1'),
     URIRef(u'http://www.example.org/meeting_organization#homePage'),
     URIRef(u'http://meetings.example.com/m1/hp')),
     ]

g.serialize(destination=None, format='xml', base=None, encoding=None, **args)
     |      If destination is None serialize method returns the serialization as a
     |      string. Format defaults to xml (AKA rdf/xml).

     |      Format support can be extended with plugins,
     |      but 'xml', 'n3', 'turtle', 'nt', 'pretty-xml', 'trix', 'trig' and 'nquads' are built in.

g.set( (s,p,o)=remove(s,p,?) e insere (s,p,o)
     
g.subject_objects( p)=[(?s,?o) for (?s,p,?o) in g]
g.subject_predicates( o) =[(?s,?p) for (?s,?p,o) in g]
g.subjects( p, o) [s for (?s,p,o) in g]
g.objects( s, p) [o for (s,p,?o) in g]
g.predicates( s, o) [p for (s,?p,o) in g]


g.add( (s,p,o))
g.add((URIRef('http://h.c/a'),URIRef('http://w.c/b'), Literal('foo')))
for a in g.triples((None,None,None)):
   
Literal(lexical_or_value, lang=None, datatype=None, normalize=None)


RDF.nil
RDF.first
RDF.rest
rdfs.class

a=BNode('abc')
b=URIRef("http://a.b.c/d")

g.namespaces()
    OWL = Namespace('http://www.w3.org/2002/07/owl#')
    RDF = rdf.namespace.ClosedNamespace('http://www.w3.org/1999/02/22-rdf-...
    RDFS = rdf.namespace.ClosedNamespace('http://www.w3.org/2000/01/rdf-sc...
    XSD = Namespace('http://www.w3.org/2001/XMLSchema#')


g.transitiveClosure( func, arg, seen=None)
g.transitive_objects(s,p)
g.transitive_subjects(p,o)

g.value(s,p,o)  #one of them is None


===

g.preferredLabel( subject, lang=None, default=None, labelProperties=(rdflib.term.URIRef('http://www.w3.org/2004/02/skos/core#prefLabel'), rdflib.term.URIRef('http://www.w3.org/2000/01/rdf-schema#label')))

skos:prefLabels 
  over rdfs:labels.
 In case at least
   Return [(labelProp, label)] labelProp is either skos:prefLabel or rdfs:label.


===
from rdflib import ConjunctiveGraph, URIRef, RDFS, Literal
from rdflib.namespace import SKOS , XSD
from pprint import pprint

     |      >>> g = ConjunctiveGraph()


===
g.bind( prefix, namespace, override=True)
    Bind prefix to namespace
    example:  graph.bind('foaf', 'http://xmlns.com/foaf/0.1/')

===

g.open( configuration, create=False)
     |      Open the graph store
     |      
     |      Might be necessary for stores that require opening a connection to a
     |      database or acquiring some resource.

g.close()
===

g.query(