owlready2 0.3

A module for ontology-oriented programming in Python: load OWL 2.0 ontologies as Python objects, modify them, save them, and perform reasoning via HermiT. Includes an optimized RDF quadstore.

Owlready2 is a module for ontology-oriented programming in Python 3, including an optimized RDF quadstore.

Owlready2 can:

• Import OWL 2.0 ontologies in NTriples, RDF/XML or OWL/XML format.

• Export OWL 2.0 ontologies to NTriples or RDF/XML.

• Manipulates ontology classes, instances and properties transparently, as if they were normal Python objects.

• Add Python methods to ontology classes.

• Perform automatic classification of classes and instances, using the HermiT reasoner.

• In addition, the quadstore is compatible with the RDFlib Pyton module, which can be used to perform SPARQL queries.

Owlready has been created by Jean-Baptiste Lamy at the LIMICS reseach lab. It is available under the GNU LGPL licence v3. In case of trouble, please contact Jean-Baptiste Lamy <jean-baptiste.lamy @ univ-paris13 . fr>

LIMICS
University Paris 13, Sorbonne Paris Cité
Bureau 149
74 rue Marcel Cachin
93017 BOBIGNY
FRANCE

What can I do with Owlready2?

Load an ontology from a local repository, or from Internet:

>>> from owlready2 import *
>>> onto_path.append("/path/to/your/local/ontology/repository")
>>> onto = get_ontology("http://www.lesfleursdunormal.fr/static/_downloads/pizza_onto.owl")
>>> onto.load()

Create new classes in the ontology, possibly mixing OWL constructs and Python methods:

>>> class NonVegetarianPizza(onto.Pizza):
...   equivalent_to = [
...     onto.Pizza
...   & ( onto.has_topping.some(onto.MeatTopping)
...     | onto.has_topping.some(onto.FishTopping)
...     ) ]
...   def eat(self): print("Beurk! I'm vegetarian!")

Access ontology class, and create new instances / individuals:

>>> onto.Pizza
pizza_onto.Pizza
>>> test_pizza = onto.Pizza("test_pizza_owl_identifier")
>>> test_pizza.has_topping = [ onto.CheeseTopping(),
...                            onto.TomatoTopping(),
...                            onto.MeatTopping  () ]

Export to RDF/XML file:

>>> test_onto.save()

Perform reasoning, and classify instances and classes:

>>> test_pizza.__class__
onto.Pizza

>>> # Execute HermiT and reparent instances and classes
>>> sync_reasoner()

>>> test_pizza.__class__
onto.NonVegetarianPizza
>>> test_pizza.eat()
Beurk! I'm vegetarian !

For more documentation, look at the doc/ directories in the source.

Changelog

version 1 - 0.2

• Fix sync_reasonner and Hermit call under windows (thanks Clare Grasso)

version 1 - 0.3

• Add warnings

• Accepts ontologies files that do not ends with ‘.owl’

• Fix a bug when loading ontologies including concept without a ‘#’ in their IRI

version 2 - 0.1

• Full rewrite, including an optimized quadstore

version 2 - 0.2

• Implement RDFXML parser and generator in Python (no longer use rapper or rdflib)

• Property chain support

• Add ntriples_diff.py utility

• Bugfixes: * Fix breaklines in literal when exporting to NTriples

version 2 - 0.3

• Add destroy_entity() global function

• Greatly improve performance for individual creation

• When searching, allow to use “*” as a jocker for any object

• Bugfixes: * Fix nested intersections and unions * Fix boolean * Fix bug when removing parent properties * Fix parsing of rdf:ID * Fix multiple loading of the same ontology whose IRI is modified by OWL file, using an ontology alias table * Fix ClassConstruct.subclasses() * Check for properties with multiple incompatible classes (e.g. ObjectProperty and Annotation Property)

Links

Owlready2 on BitBucket (development repository): https://bitbucket.org/jibalamy/owlready2

Owlready2 on PyPI (Python Package Index, stable release): https://pypi.python.org/pypi/Owlready2

Documentation: http://pythonhosted.org/Owlready2

Forum/Mailing list: http://owlready.8326.n8.nabble.com

Mail me for any comment, problem, suggestion or help !

Jiba – Jean-Baptiste LAMY – jibalamy @ free.fr