メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.323888404713 43.0471185408216, 141.32374972001 43.0476869454673, 141.322620537197 43.0471490617734, 141.32269194937 43.0468901253827, 141.322874228458 43.0466364479874, 141.322891407173 43.046610073118, 141.32331955703 43.0460248135514, 141.324042828896 43.046383511648, 141.32406900382 43.0463965236534, 141.323888404713 43.0471185408216)) ^^http://www.opengis.net/ont/geosparql#wktLiteral