query: SELECT ?Property_ ?Property_Label ?Property_Description ?class_ ?class_Label ?relation_ ?relation_Label
  WHERE {
    
  	?Property_ p:P2302 ?constraint_statement .
  	?constraint_statement ps:P2302 wd:Q21503250 .
  	OPTIONAL {?constraint_statement pq:P2308 ?class_ .}
  	OPTIONAL {?constraint_statement pq:P2309 ?relation_ .}
  
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  
  } 