Ontogram

An OWL ontology diagram generator.

Currently it supports owl:class, rdfs:subClassOf, owl:equivalentClass, datatype properties and domain and range relationships. I am planning to add support for owl:subClassOf restrictions soon.

Example output

The output of examples/tern-org.ttl.

Installation

Install via PyPI for Python 3.

pip3 install ontogram

Usage

Command line application

$ ontogram --help

Usage: ontogram [OPTIONS] ONTOLOGY_FILEPATH

  Ontogram CLI is a tool to generate a diagram from an OWL ontology file.

Options:
  --format ['turtle', 'xml', 'nt', 'n3']
                                  RDF serialization of input file. Default is
                                  turtle.
  --help                          Show this message and exit.

Use Ontogram's CLI to generate diagrams of an OWL ontology.

ontogram ontology.ttl

Output will be 3 files, ontology.ttl.txt, ontology.ttl.png, ontology.ttl.svg.

Use the --format option to specify the RDF serialization of the ontology if it is not Turtle.

Python library

Ontogram is a Python library and can be easily integrated with any existing Python application.

from ontogram import Ontogram

# First parameter accepts a file path to the OWL ontology. 
# Second parameter tells Ontogram what RDF format the OWL ontology is in.
ontogram = Ontogram('ontology.ttl', format='turtle')

# Generate a PNG diagram from the OWl ontology and write to disk as 'ontology.ttl.txt'.
ontogram.png_file('ontology.ttl.txt')

# Same as above, but as an SVG diagram. 
ontogram.svg_file('ontology.ttl.svg')

See the examples directory for example outputs.