Example of making an RDF "Bag" with rdflib in Python

bag.py

# encoding: utf-8

import rdflib

book            = rdflib.URIRef(u'urn:isbn:978-3-16-148410-0')
bookType        = rdflib.URIRef(u'urn:publishing:schema:book')
authorPredicate = rdflib.URIRef(u'http://purl.org/dc/terms/creator')
joyce           = rdflib.URIRef(u'urn:foaf:registered-people:joyce')
kelly           = rdflib.URIRef(u'http://twitter.org/nutjob4life')
mattmann        = rdflib.URIRef(u'http://people.apache.org/mattmann')

# We have a book
g = rdflib.Graph()
g.add((book, rdflib.RDF.type, bookType))

# It has a collection of authors
bag = rdflib.BNode()
g.add((book, authorPredicate, bag))

# The collection is a "Bag"
g.add((bag, rdflib.RDF.type, rdflib.RDF.Bag))

# The bag has 3 authors
g.add((bag, rdflib.URIRef(u'http://www.w3.org/1999/02/22-rdf-syntax-ns#_1'), joyce))
g.add((bag, rdflib.URIRef(u'http://www.w3.org/1999/02/22-rdf-syntax-ns#_2'), kelly))
g.add((bag, rdflib.URIRef(u'http://www.w3.org/1999/02/22-rdf-syntax-ns#_3'), mattmann))

# That's it.
print g.serialize()