メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.8812500 33.5833333, 135.8875000 33.5833333, 135.8875000 33.5875000, 135.8812500 33.5875000, 135.8812500 33.5833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral