メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.352464207838 43.0590088143078, 141.352320177215 43.0595854430179, 141.350745552403 43.0593712276657, 141.350900712085 43.0587953223085, 141.351051413292 43.0582290157754, 141.352605900823 43.0584278774372, 141.352464207838 43.0590088143078)) ^^http://www.opengis.net/ont/geosparql#wktLiteral