def testUnivInversion(self):
UniversalNominalRangeTransformer().transform(self.ontGraph)
self.failUnlessEqual(len(list(self.foo.subClassOf)), 1,
"There should still be one subsumed restriction")
subC = CastClass(first(self.foo.subClassOf))
self.failUnless(not isinstance(subC, Restriction),
"subclass of a restriction")
self.failUnless(subC.complementOf is not None,
"Should be a complement.")
innerC = CastClass(subC.complementOf)
self.failUnless(isinstance(innerC, Restriction),
"complement of a restriction, not %r" % innerC)
self.failUnlessEqual(innerC.onProperty, EX_NS.propFoo,
"restriction on propFoo")
self.failUnless(
innerC.someValuesFrom,
"converted to an existential restriction not %r" % innerC)
invertedC = CastClass(innerC.someValuesFrom)
self.failUnless(isinstance(invertedC, EnumeratedClass),
"existential restriction on enumerated class")
self.assertEqual(
len(invertedC), 2,
"existencial restriction on enumerated class of length 2")
self.assertEqual(repr(invertedC), "{ ex:individual2 ex:individual3 }",
"The negated partition should exclude individual1")
NominalRangeTransformer().transform(self.ontGraph)
DemorganTransformer().transform(self.ontGraph)
subC = CastClass(first(self.foo.subClassOf))
self.assertEqual(
repr(subC),
"( ( not ( ex:propFoo value ex:individual2 ) ) and ( not ( ex:propFoo value ex:individual3 ) ) )"
)
def SubSumptionExpansion(owlClass):
owlClass = CastClass(owlClass)
if isinstance(owlClass, BooleanClass) and owlClass._operator == OWL_NS.unionOf:
for member in owlClass:
expanded = False
for innerMember in SubSumptionExpansion(Class(member)):
expanded = True
yield innerMember
if not expanded:
yield member
else:
for member in owlClass.subSumpteeIds():
expanded = False
for innerMember in SubSumptionExpansion(Class(member)):
expanded = True
yield innerMember
if not expanded:
yield member
def testHiddenDemorgan(self):
NormalFormReduction(self.ontGraph)
self.failUnless(first(self.foo.subClassOf).complementOf,
"should be the negation of a boolean class")
innerC = CastClass(first(self.foo.subClassOf).complementOf)
self.failUnless(isinstance(innerC, BooleanClass) and
innerC._operator == OWL_NS.intersectionOf,
"should be the negation of a conjunct")
self.assertEqual(repr(innerC), "( ex:alpha and ex:omega )")
def ComplementExpansion(owlClass, debug=False):
"""
For binary conjunctions of a positive conjunction concept and a negative atomic concept
"""
owlClass = CastClass(owlClass.identifier, owlClass.graph)
if isinstance(owlClass, BooleanClass) and \
len(owlClass) == 2 and owlClass._operator == OWL_NS.intersectionOf:
oldRepr = owlClass.__repr__()
# A boolean-constructed class
negativeClasses = set()
otherClasses = set()
for member in owlClass:
member = Class(member)
if member.complementOf:
# A negative class, expand it and add to bucket of classes to
# 'remove'
for expandedClass in SubSumptionExpansion(member.complementOf):
negativeClasses.add(expandedClass)
else:
# A positive class, expand it and add to bucket of base classes
expanded = False
for expandedClass in SubSumptionExpansion(member):
expanded = True
otherClasses.add(expandedClass)
if not expanded:
otherClasses.add(member.identifier)
if negativeClasses:
# Delete the old list of operands for the boolean class
oldList = owlClass._rdfList
oldList.clear()
# Recreate the list of operands, exluding the expanded negative
# classes
for allowedClasses in otherClasses.difference(negativeClasses):
oldList.append(classOrIdentifier(allowedClasses))
owlClass.changeOperator(OWL_NS.unionOf)
if debug:
print("Incoming boolean class: ", oldRepr)
print("Expanded boolean class: ", owlClass.__repr__())
return owlClass
else:
if debug:
print("There were no negative classes.")
def SubSumptionExpansion(owlClass):
owlClass = CastClass(owlClass)
if isinstance(owlClass,
BooleanClass) and owlClass._operator == OWL_NS.unionOf:
for member in owlClass:
expanded = False
for innerMember in SubSumptionExpansion(Class(member)):
expanded = True
yield innerMember
if not expanded:
yield member
else:
for member in owlClass.subSumpteeIds():
expanded = False
for innerMember in SubSumptionExpansion(Class(member)):
expanded = True
yield innerMember
if not expanded:
yield member
def ComplementExpansion(owlClass, debug=False):
"""
For binary conjunctions of a positive conjunction concept and a negative atomic concept
"""
owlClass = CastClass(owlClass.identifier, owlClass.graph)
if isinstance(owlClass, BooleanClass) and \
len(owlClass) == 2 and owlClass._operator == OWL_NS.intersectionOf:
oldRepr = owlClass.__repr__()
# A boolean-constructed class
negativeClasses = set()
otherClasses = set()
for member in owlClass:
member = Class(member)
if member.complementOf:
# A negative class, expand it and add to bucket of classes to
# 'remove'
for expandedClass in SubSumptionExpansion(member.complementOf):
negativeClasses.add(expandedClass)
else:
# A positive class, expand it and add to bucket of base classes
expanded = False
for expandedClass in SubSumptionExpansion(member):
expanded = True
otherClasses.add(expandedClass)
if not expanded:
otherClasses.add(member.identifier)
if negativeClasses:
# Delete the old list of operands for the boolean class
oldList = owlClass._rdfList
oldList.clear()
# Recreate the list of operands, exluding the expanded negative
# classes
for allowedClasses in otherClasses.difference(negativeClasses):
oldList.append(classOrIdentifier(allowedClasses))
owlClass.changeOperator(OWL_NS.unionOf)
if debug:
print("Incoming boolean class: ", oldRepr)
print("Expanded boolean class: ", owlClass.__repr__())
return owlClass
else:
if debug:
print("There were no negative classes.")
def ProcessConcept(klass, owlGraph, FreshConcept, newOwlGraph):
"""
This method implements the pre-processing portion of the completion-based procedure
and recursively transforms the input ontology one concept at a time
"""
iD = klass.identifier
# maps the identifier to skolem:bnodeLabel if
# the identifier is a BNode or to skolem:newBNodeLabel
# if its a URI
FreshConcept[iD] = SkolemizeExistentialClasses(
BNode() if isinstance(iD, URIRef) else iD
)
# A fresh atomic concept (A_c)
newCls = Class(FreshConcept[iD], graph=newOwlGraph)
cls = CastClass(klass, owlGraph)
# determine if the concept is the left, right (or both)
# operand of a subsumption axiom in the ontology
location = WhichSubsumptionOperand(iD, owlGraph)
# log.debug(repr(cls))
if isinstance(iD, URIRef):
# An atomic concept?
if location in [LEFT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
log.debug(
"Original (atomic) concept appears in the left HS of a subsumption axiom")
# If class is left operand of subsumption operator,
# assert (in new OWL graph) that A_c subsumes the concept
_cls = Class(cls.identifier, graph=newOwlGraph)
newCls += _cls
log.debug("%s subsumes %s" % (newCls, _cls))
if location in [RIGHT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
log.debug(
"Original (atomic) concept appears in the right HS of a subsumption axiom")
# If class is right operand of subsumption operator,
# assert that it subsumes A_c
_cls = Class(cls.identifier, graph=newOwlGraph)
_cls += newCls
log.debug("%s subsumes %s" % (_cls, newCls))
elif isinstance(cls, Restriction):
if location != NEITHER_SUBSUMPTION_OPERAND:
# appears in at least one subsumption operator
# An existential role restriction
log.debug(
"Original (role restriction) appears in a subsumption axiom")
role = Property(cls.onProperty, graph=newOwlGraph)
fillerCls = ProcessConcept(
Class(cls.restrictionRange),
owlGraph,
FreshConcept,
newOwlGraph)
# leftCls is (role SOME fillerCls)
leftCls = role | some | fillerCls
log.debug("let leftCls be %s" % leftCls)
if location in [LEFT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
# if appears as the left operand, we say A_c subsumes
# leftCls
newCls += leftCls
log.debug("%s subsumes leftCls" % newCls)
if location in [RIGHT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
# if appears as right operand, we say left Cls subsumes A_c
leftCls += newCls
log.debug("leftCls subsumes %s" % newCls)
else:
assert isinstance(cls, BooleanClass), "Not ELH ontology: %r" % cls
assert cls._operator == OWL_NS.intersectionOf, "Not ELH ontology"
log.debug(
"Original conjunction (or boolean operator wlog ) appears in a subsumption axiom")
# A boolean conjunction
if location != NEITHER_SUBSUMPTION_OPERAND:
members = [ProcessConcept(Class(c),
owlGraph,
FreshConcept,
newOwlGraph) for c in cls]
newBoolean = BooleanClass(
BNode(), members=members, graph=newOwlGraph)
# create a boolean conjunction of the fresh concepts corresponding
# to processing each member of the existing conjunction
if location in [LEFT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
# if appears as the left operand, we say the new conjunction
# is subsumed by A_c
newCls += newBoolean
log.debug("%s subsumes %s" % (newCls, newBoolean))
if location in [RIGHT_SUBSUMPTION_OPERAND, BOTH_SUBSUMPTION_OPERAND]:
# if appears as the right operand, we say A_c is subsumed by
# the new conjunction
newBoolean += newCls
log.debug("%s subsumes %s" % (newBoolean, newCls))
return newCls
