One World Language, aka One World Language, is an actively used xml format created in 2004.

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Example code from Linguist:

<?xml version="1.0"?>


<!DOCTYPE rdf:RDF [
    <!ENTITY owl "http://www.w3.org/2002/07/owl#" >
    <!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
    <!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
    <!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
]>


<rdf:RDF xmlns="http://www.co-ode.org/ontologies/pizza/pizza.owl#"
     xml:base="http://www.co-ode.org/ontologies/pizza/pizza.owl"
     xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
     xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:owl="http://www.w3.org/2002/07/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 http://www.co-ode.org/resources/tutorials/)</rdfs:comment>
    </owl:Ontology>
    


    <!-- 
    ///////////////////////////////////////////////////////////////////////////
    //
    //   OWL Classes
    //
    ///////////////////////////////////////////////////////////////////////////
     -->

    


    <!-- Class: http://www.co-ode.org/ontologies/pizza/pizza.owl#American -->

    <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 code from Wikipedia:

<http://example.org/tea.owl> rdf:type owl:Ontology .
 :Tea  rdf:type            owl:Class .
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Last updated February 11th, 2019