メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9750000 34.1500000, 131.9812500 34.1500000, 131.9812500 34.1541667, 131.9750000 34.1541667, 131.9750000 34.1500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral