メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6000000 32.9750000, 131.6062500 32.9750000, 131.6062500 32.9791667, 131.6000000 32.9791667, 131.6000000 32.9750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral