メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.0500000 34.5833333, 136.0562500 34.5833333, 136.0562500 34.5875000, 136.0500000 34.5875000, 136.0500000 34.5833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral