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julijaovcinnikova edited this page Mar 9, 2026
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Ontologies
An ontology is a set of precise descriptive statements about some part of the world (usually referred to as the domain of interest or the subject matter of the ontology). Precise descriptions satisfy several purposes: most notably, they prevent misunderstandings in human communication and they ensure that software behaves in a uniform, predictable way and works well with other software.
What is OWL 2 OWL 2 Primer
Ontology Seed Diagram
New Diagram
On the "Diagrams" screen, click the "New Diagram" button and the "New Diagram" form will appear.
Existing Diagram
Select the ontology seed diagram from the list.
Classes
In OWLGrEd notation, classes are represented by yellow nodes with the name of the class at the top.
Class Hierarchies
Subclass Of – generalization notation
Subclass Of – horizontal fork notation
Subclass Of – text notation
Individuals
In OWLGrEd notation, individuals are represented by purple nodes.