ontor - an ontology editor based on Owlready2
Project description
ONTology editOR (ontor)
ontology editor built on Owlready2
functionality
each instance of the ontor class represents an individual ontology and provides support for:
- creating new, loading existing, and saving ontologies
- modifying ontologies:
- import other ontologies
- simply extract information such as axioms and class restrictions
- insert classes, properties, instances, relations, and restrictions
- delete classes, properties, instances, relations, and restrictions but preserve the ontology's structure by reassigning subclasses and instances appropriately
- reasoning over ontologies and debugging by interactively deleting problematic axioms
- visualizing the entire ontology or selected parts thereof
ontor provides a tuple based syntax with JSON and CSV support for ontology editing to facilitate focusing on the ontology's content
requirements and installation
- Python 3.9+
- install ontor using pip
- from PyPI:
pip install ontor
- from GitHub, in editable mode:
pip install -e .
- from PyPI:
- generate documentation via sphinx using the makefile in docs/:
make html
demo
the directory example/ includes a demo application inspired by Protégé's pizza example
interactively debug an ontology
in the example: ontor3.debug_onto()
visualize selected instances, classes, and properties in a given radius around a focus node; e.g., all nodes in a radius of two relations around the node "John"
in the example: ontor3.visualize(classes=["human", "pizza"], properties=["likes", "diameter_in_cm"], focusnode="John", radius=2)
When creating ontologies from scratch, note that some functions have to be called in a specific order:
- add_taxo - the taxonomy has to be created first to ensure that all classes are defined, which are required by the properties, axioms, and individuals
- add_ops, add_dps - properties must be defined before axioms can be specified
- add_axioms, add_instances - axioms and instances can only be added when all the necessary classes and properties have been defined
license
GPL v3.0
contact
Felix Ocker - felix.ocker@googlemail.com
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