メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.5375000 35.0083333, 135.5437500 35.0083333, 135.5437500 35.0125000, 135.5375000 35.0125000, 135.5375000 35.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral