02/05/2026

Owlready2 0.50 has been released!

Owlready is a Python module for ontology-oriented programming. It can load OWL 2.0 ontologies and manipulate them transparently in Python.

This new version fixes a security problem in Pellet (NB in pratice, this problem concerns only direct call to Pellet, but not those done through Owlready).

Here are the changes:

  • Improve French ICD10 import to support the RDF format from ATIH (now the default)

  • Improve French ICD10 import with management of sub-codes defined by modifers (CLAML format)

  • Fix vulnerability CVE-2021-39239 in Jena (used by Pellet) This vulnerability concerns XML parsing but Owlready2 does not use XML for communicating with Pellet (it uses NTriple) For more security, XMLRDF loading has been disabled in Jena

  • Fix for Python 3.14 (tests, Cython-optimized module)

  • Bugfixes:

    • Fix ontology loading from file object inside a Zip file

    • Fix test test_parallel_4

The new version be downloaded from PyPI (Python Package Index): https://pypi.python.org/pypi/Owlready2