メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.352756535824 43.0578517222036, 141.352605900823 43.0584278774372, 141.351051413292 43.0582290157754, 141.351205431723 43.0576389637926, 141.35134902816 43.0570595899745, 141.352907367336 43.0572685347973, 141.352756535824 43.0578517222036)) ^^http://www.opengis.net/ont/geosparql#wktLiteral