Example

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

>>> from owlready 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 restrictions and Python methods:

>>> class NonVegetarianPizza(onto.Pizza):
...   equivalent_to = [
...     onto.Pizza
...   & ( restriction("has_topping", SOME, onto.MeatTopping)
...     | restriction("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 OWL/XML file:

>>> test_onto.save()

Perform reasoning, and classify instances and classes:

>>> test_pizza.__class__
onto.Pizza

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

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

More examples are available in the documentation and the /doc/examples directory in the sources.