Proper OWL2 EL profile learning support

Open LorenzBuehmann opened this issue 10 years ago • 0 comments

In OWL2 EL only the following constructs are supported(see http://www.w3.org/TR/owl2-profiles/#OWL_2_EL):

existential quantification to a class expression (ObjectSomeValuesFrom) or a data range (DataSomeValuesFrom)
existential quantification to an individual (ObjectHasValue) or a literal (DataHasValue)
self-restriction (ObjectHasSelf)
enumerations involving a single individual (ObjectOneOf) or a single literal (DataOneOf)
intersection of classes (ObjectIntersectionOf) and data ranges (DataIntersectionOf)

The basic EL learning algorithm ELTL only supports a subset of the constructs above, i.e. everything seems to be correct. On the other hand, we should add support for DataSomeValuesFrom and DataHasValue.

A special case is (ELTL + disjunctive) which also uses disjunction of class expression, i.e. solution might not be fit to OWL2 EL. Moreover, support for DataSomeValuesFrom was recently added. The problem here is that only a particular set of datatypes is supported (which is necessary to obtain the desired computational properties):

rdf:PlainLiteral
rdf:XMLLiteral
rdfs:Literal
owl:real
owl:rational
xsd:decimal
xsd:integer
xsd:nonNegativeInteger
xsd:string
xsd:normalizedString
xsd:token
xsd:Name
xsd:NCName
xsd:NMTOKEN
xsd:hexBinary
xsd:base64Binary
xsd:anyURI
xsd:dateTime
xsd:dateTimeStamp

This means, that e.g. xsd:double can not be used and it's not clear how to handle such cases.

May 15 '15 08:05 LorenzBuehmann