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Notation

julijaovcinnikova edited this page Apr 22, 2026 · 17 revisions

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

Seed

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.

Select an element from the left toolbar and edit its details in the right properties panel.

Namespaces declaration

Namespaces

Classes

In OWLGrEd notation, classes are represented by yellow nodes with the name of the class at the top. class

Class Hierarchies

Subclass Of – generalization notation

generalization

Subclass Of – horizontal fork notation

generalizationFork

Subclass Of – text notation

supersclasses

Equivalent Classes

Equivalent Classes - Line Notation

equivalent1

Equivalent Classes - Node Notation

equivalent2

Equivalent Classes - Text Notation

equivalent3

Disjoint Classes

Disjoint Classes - Line Notation

disjoint1

Disjoint Classes - Node Notation

disjoint2

Disjoint Classes - Text Notation

disjoint3

Has Key

HasKey

Individuals

In OWLGrEd notation, individuals are represented by purple nodes.

Instance

Instance Of

Instance Of – line notation

InstanceOf

Instance Of – text notation

InstanceOf2

Same individuals

Same individuals - line notation

sameAs1

Same individuals - node notation

sameAs2

Same individuals - text notation

sameAs3

Different individuals

Different individuals - line notation

different1

Different individuals - node notation

different2

Different individuals - text notation

different3

Object Properties

Object Property Association notation

Association

Object Property - Node notation

AssociationNode

Object Property Assertion - line notation

objectPropertyAssertion

Object Property Assertion - Node notation

objectPropertyAssertionNode

Data Properties

Data Properties - text notation

dataProperty

Data Property - node notation

dataPropertyNode

Data Property Assertion - text notation

dataPropertyAssertion

Data Property Assertion - node notation

dataPropertyAssertionNode

Datatypes

dataType

Property Restrictions

restriction

Annotations

Annotation - node notation

Annotation1

Annotation - text notation

annotation2

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