メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4750000 34.4291667, 136.4812500 34.4291667, 136.4812500 34.4333333, 136.4750000 34.4333333, 136.4750000 34.4291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral