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"""A pure Python package providing the core RDF constructs.
The packages is intended to provide the core RDF types and interfaces
for working with RDF. The package defines a plugin interface for
parsers, stores, and serializers that other packages can use to
implement parsers, stores, and serializers that will plug into the
rdflib package.
The primary interface `rdflib` exposes to work with RDF is
`rdflib.graph.Graph`.
A tiny example:
>>> 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))
graph has 4 statements.
>>>
>>> for s, p, o in g:
... if (s, p, o) not in g:
... raise Exception("It better be!")
>>> 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')),
... (URIRef(u'http://www.example.org/people#fred'),
... URIRef(u'http://www.example.org/meeting_organization#attending'),
... URIRef(u'http://meetings.example.com/cal#m1')),
... (URIRef(u'http://www.example.org/people#fred'),
... URIRef(u'http://www.example.org/personal_details#GivenName'),
... Literal(u'Fred')),
... (URIRef(u'http://www.example.org/people#fred'),
... URIRef(u'http://www.example.org/personal_details#hasEmail'),
... URIRef(u'mailto:fred@example.com'))
... ]
True
"""
__docformat__ = "restructuredtext en"
# The format of the __version__ line is matched by a regex in setup.py
__version__ = "4.2.1-dev"
__date__ = "2015/02/19"
__all__ = [
'URIRef',
'BNode',
'Literal',
'Variable',
'Namespace',
'Dataset',
'Graph',
'ConjunctiveGraph',
'RDF',
'RDFS',
'OWL',
'XSD',
'util',
]
import sys
assert sys.version_info >= (2, 5, 0), "rdflib requires Python 2.5 or higher"
del sys
import logging
import __main__
if not hasattr(__main__, '__file__'):
# show log messages in interactive mode
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
logger.info("RDFLib Version: %s" % __version__)
try:
unichr(0x10FFFF)
except ValueError:
import warnings
warnings.warn(
'You are using a narrow Python build!\n'
'This means that your Python does not properly support chars > 16bit.\n'
'On your system chars like c=u"\\U0010FFFF" will have a len(c)==2.\n'
'As this can cause hard to debug problems with string processing\n'
'(slicing, regexp, ...) later on, we strongly advise to use a wide\n'
'Python build in production systems.',
ImportWarning)
del warnings
NORMALIZE_LITERALS = True
"""
If True - Literals lexical forms are normalized when created.
I.e. the lexical forms is parsed according to data-type, then the
stored lexical form is the re-serialized value that was parsed.
Illegal values for a datatype are simply kept. The normalized keyword
for Literal.__new__ can override this.
For example:
>>> from rdflib import Literal,XSD
>>> Literal("01", datatype=XSD.int)
rdflib.term.Literal(u'1', datatype=rdflib.term.URIRef(u'http://www.w3.org/2001/XMLSchema#integer'))
This flag may be changed at any time, but will only affect literals
created after that time, previously created literals will remain
(un)normalized.
"""
DAWG_LITERAL_COLLATION = False
"""
DAWG_LITERAL_COLLATION determines how literals are ordered or compared
to each other.
In SPARQL, applying the >,<,>=,<= operators to literals of
incompatible data-types is an error, i.e:
Literal(2)>Literal('cake') is neither true nor false, but an error.
This is a problem in PY3, where lists of Literals of incompatible
types can no longer be sorted.
Setting this flag to True gives you strict DAWG/SPARQL compliance,
setting it to False will order Literals with incompatible datatypes by
datatype URI
In particular, this determines how the rich comparison operators for
Literal work, eq, __neq__, __lt__, etc.
"""
from rdflib.term import (
URIRef, BNode, Literal, Variable)
from rdflib.namespace import Namespace
from rdflib.graph import Dataset, Graph, ConjunctiveGraph
from rdflib.namespace import RDF, RDFS, OWL, XSD
from rdflib import plugin
from rdflib import query
# tedious sop to flake8
assert plugin
assert query
from rdflib import util
|
