construct distinct {cs} rdf:type {owl:Ontology},
   {cs} rdfs:comment {cslab}
from {cs} rdf:type {skos:ConceptScheme},
   {cs} rdfs:label {cslab}

union

construct distinct
   {x} rdf:type {owl:Class},
   {x} rdfs:label {pref},
   {x} rdfs:label {alt},
   {x} rdfs:label {hid},
   {x} rdfs:subClassOf {bc},
   {x} rdfs:subClassOf {gr},
   {x} rdfs:subClassOf {th},
   {x} rdfs:seeAlso {rc},
   {x} rdfs:comment {gsn},
   {x} rdfs:comment {hisn}
from {x} rdf:type {skos:Concept},
   [{x} gemet:group {gr}],
   [{x} gemet:theme {th}],
   [{x} skos:inScheme {cs} rdfs:label {cslab}],
   [{x} skos:prefLabel {pref}],
   [{x} skos:altLabel {alt}],
   [{x} skos:hiddenLabel {hid}],
   [{x} skos:broader {bc}],
   [{x} skos:related {rc}],
   [{x} skos:scopeNote {gsn}],
   [{x} skos:editorialNote {hisn}]

union

construct distinct
   {x} rdf:type {owl:Class},
   {x} rdf:type {gemet:Theme},
   {x} rdfs:label {pref}
from {x} rdf:type {gemet:Theme},
   [{x} rdfs:label {pref}]

union

construct distinct
   {x} rdf:type {owl:Class},
   {x} rdf:type {gemet:Group},
   {sgr} rdf:type {gemet:SuperGroup},
   {x} rdfs:label {pref},
   {x} rdfs:subClassOf {sgr}
from {x} rdf:type {gemet:Group},
   [{x} rdfs:label {pref}],
   [{x} gemet:subGroupOf {sgr}]

using namespace
  skos = <http://www.w3.org/2004/02/skos/core#>,
  owl = <http://www.w3.org/2002/07/owl#>,
  dc = <http://purl.org/dc/elements/1.1/>,
  gemet = <http://www.eionet.eu.int/gemet/2004/06/gemet-schema.rdf#>