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# OWL Cheatsheet

## Unique Features
- Formal ontology language for representing knowledge in a machine-readable format
- Based on Description Logic, a subset of first-order logic
- Supports rich modeling of concepts and relationships between them
- Used in artificial intelligence, bioinformatics, and semantic web applications

## Classes

Class: class_name

## Properties

ObjectProperty: property_name

DatatypeProperty: property_name

AnnotationProperty: property_name

## Individuals

Individual: individual_name

## Class Expressions

Class: class_expression_name

EquivalentTo: class_expression

## Property Expressions

ObjectProperty: property_expression_name

EquivalentTo: property_expression

## Axioms

SubClassOf: class_expression1 class_expression2

EquivalentClasses: class_expression1 class_expression2

SubObjectPropertyOf: property_expression1 property_expression2

EquivalentObjectProperties: property_expression1 property_expression2

## Annotations

AnnotationProperty: annotation_property_name

AnnotationAssertion: annotation_property_name(individual_name "annotation_value")

## Resources
- [OWL Web Ontology Language Guide](https://www.w3.org/TR/owl-guide/)
- [OWL 2 Web Ontology Language Primer](https://www.w3.org/TR/owl2-primer/)
- [Protégé](https://protege.stanford.edu/) (ontology editor and development environment)
- [OWL API](https://github.com/owlcs/owlapi) (Java library for working with OWL)