メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3812500 34.1541667, 131.3875000 34.1541667, 131.3875000 34.1583333, 131.3812500 34.1583333, 131.3812500 34.1541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral