owlapy 0.1.1

Owlapy is loosely based on owlapi - the java counterpart, successfully representing the main owl objects in python.

owlapy

Owlapy is loosely based on owlapi - the java counterpart, successfully representing the main owl objects in python.

Other than that, Owlapy also offers some extra functionalities:

• Owl2SparqlConverter to convert owl class expressions to SPARQL syntax.
• DLSyntaxObjectRenderer to render owl objects to description logics.
• ManchesterOWLSyntaxParser to parse strings of manchester syntax to owl class expression.

For more, you can check the API documentation.

Installation

pip install owlapy

Usage

In this example we start with a simple atomic class expression and move to some more complex ones and finally render and print the last of them in description logics syntax.

from owlapy.render import DLSyntaxObjectRenderer
from owlapy.model import IRI, OWLClass, OWLObjectProperty, OWLObjectSomeValuesFrom, \
                         OWLObjectIntersectionOf

# Create an IRI object using the iri as a string for 'male' class.
male_iri = IRI.create('http://example.com/society#male')

# Create the male class
male = OWLClass(male_iri)

# Create an object property using the iri as a string for 'hasChild' property.
hasChild = OWLObjectProperty(IRI.create('http://example.com/society#hasChild'))

# Create an existential restrictions
males_with_children = OWLObjectSomeValuesFrom(hasChild, male)

# Let's make it more complex by intersecting with another class
teacher = OWLClass(IRI.create('http://example.com/society#teacher'))
male_teachers_with_children = OWLObjectIntersectionOf([males_with_children, teacher])

# You can render and print owl class expressions in description logics syntax
print(DLSyntaxObjectRenderer().render(male_teachers_with_children))

The following will be printed:

(∃ hasChild.male) ⊓ teacher

Every OWL object that can be used to classify individuals, is considered a class expression and inherits from OWLClassExpression class. In the above examples we have introduced 3 types of class expressions:

• OWLClass,
• OWLObjectSomeValuesFrom
• OWLObjectIntersectionOf.

Like we showed in this example, you can create all kinds of class expressions using the OWL objects in owlapy model.

Are you looking for more?

The java owlapi library also offers classes for OWL ontology, manager and reasoner. We have also implemented those classes in python, but for the time being we are not including them in owlapy. You can find all of those classes in Ontolearn, which is a python library that offers more than just that.

In case you have any question or request please don't hesitate to open an issue.