メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.913974447367 43.5025316883643, 141.912369126579 43.5027789997664, 141.911870361265 43.5011141996876, 141.913297651968 43.5008820865005, 141.913455920173 43.5009902227073, 141.913603437883 43.5010775463927, 141.913907814423 43.50128347943, 141.914007444497 43.501391512452, 141.914109383532 43.5015186476828, 141.914141784452 43.501702926842, 141.9140781055 43.5019911495794, 141.913971386951 43.5022966487092, 141.913974447367 43.5025316883643)) ^^http://www.opengis.net/ont/geosparql#wktLiteral