Top 1,000 Features Creators Events Podcasts Extensions Blog Explorer CSV Download


< >

OWL, aka One World Language, is a xml format created in 2004.

#282on PLDB 20Years Old 199Repos

The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies. Ontologies are a formal way to describe taxonomies and classification networks, essentially defining the structure of knowledge for various domains: the nouns representing classes of objects and the verbs representing relations between the objects. Ontologies resemble class hierarchies in object-oriented programming but there are several critical differences. Read more on Wikipedia...

Example from Linguist:
<?xml version="1.0"?> <!DOCTYPE rdf:RDF [ <!ENTITY owl "" > <!ENTITY xsd "" > <!ENTITY rdfs "" > <!ENTITY rdf "" > ]> <rdf:RDF xmlns="" xml:base="" xmlns:xsd="" xmlns:rdfs="" xmlns:rdf="" xmlns:owl=""> <owl:Ontology rdf:about=""> <owl:versionInfo xml:lang="en" >v.1.4. Added Food class (used in domain/range of hasIngredient), Added several hasCountryOfOrigin restrictions on pizzas, Made hasTopping invers functional</owl:versionInfo> <owl:versionInfo rdf:datatype="&xsd;string">version 1.5</owl:versionInfo> <owl:versionInfo xml:lang="en" >v.1.5. Removed protege.owl import and references. Made ontology URI date-independent</owl:versionInfo> <rdfs:comment xml:lang="en" >An example ontology that contains all constructs required for the various versions of the Pizza Tutorial run by Manchester University (see</rdfs:comment> </owl:Ontology> <!-- /////////////////////////////////////////////////////////////////////////// // // OWL Classes // /////////////////////////////////////////////////////////////////////////// --> <!-- Class: --> <owl:Class rdf:about="#American"> <rdfs:label xml:lang="pt">Americana</rdfs:label> <rdfs:subClassOf> <owl:Restriction> <owl:onProperty rdf:resource="#hasTopping"/> <owl:someValuesFrom rdf:resource="#TomatoTopping"/> </owl:Re
Example from Wikipedia:
<> rdf:type owl:Ontology . :Tea rdf:type owl:Class .

Language features

Feature Supported Example Token
Line Comments X

View source

- Build the next great programming language About Resources Acknowledgements Part of the World Wide Scroll