@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ex:      <http://example.org/vocab#> .
@prefix wdrs:    <http://www.w3.org/2007/05/powder-s#> .
@prefix owl:     <http://www.w3.org/2002/07/owl#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

<>    rdf:type owl:Ontology ;
      wdrs:issued "2007-12-14T00:00:00" ;
      wdrs:issuedby <http://authority.example.org/company.rdf#me> .

[]    rdf:type owl:Class ;
      rdfs:subClassOf <#silver> ;
      owl:equivalentClass
              [ rdf:type owl:Class ;
                owl:intersectionOf ([ rdf:type owl:Restriction ;
                            owl:hasValue "\\:\\/\\/(([^\\/\\?\\#]*)\\@)?([^\\:\\/\\?\\#\\@]+\\.)?(example\\.com)(:([0-9]+))?\\/"^^<http://www.w3.org/2001/XMLSchema-datatypes#string> ;
                            owl:onProperty wdrs:matchesregex
                          ])
              ] .

[]    rdf:type owl:Class ;
      rdfs:subClassOf <#silver> ;
      owl:equivalentClass
              [ rdf:type owl:Class ;
                owl:intersectionOf ([ rdf:type owl:Restriction ;
                            owl:hasValue "\\:\\/\\/(([^\\/\\?\\#]*)\\@)?([^\\:\\/\\?\\#\\@]+\\.)?(example\\.org)(:([0-9]+))?\\/"^^<http://www.w3.org/2001/XMLSchema-datatypes#string> ;
                            owl:onProperty wdrs:matchesregex
                          ])
              ] .

<#silver>
      rdf:type owl:Class .