@prefix gist: <https://w3id.org/semanticarts/ns/ontology/gist/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

gist:ProductSpecification owl:equivalentClass [ a owl:Class ;
            owl:intersectionOf ( gist:CatalogItem [ a owl:Restriction ;
                        owl:onProperty gist:isCategorizedBy ;
                        owl:someValuesFrom gist:ProductCategory ] ) ] .

gist:ProductCategory a owl:Class ;
    rdfs:label "Product Category"^^xsd:string ;
    rdfs:comment "DEFINITION: Any of many ways of categorizing products."^^xsd:string,
        "EXAMPLE: Automobile models, NATO product codes."^^xsd:string ;
    rdfs:isDefinedBy <https://w3id.org/semanticarts/ontology/gistCore14.1.0> ;
    rdfs:subClassOf gist:Category ;
    skos:definition "Any of many ways of categorizing products."^^xsd:string ;
    skos:example "Automobile models, NATO product codes."^^xsd:string ;
    skos:prefLabel "Product Category"^^xsd:string .