メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.5000000 34.9750000, 138.5062500 34.9750000, 138.5062500 34.9791667, 138.5000000 34.9791667, 138.5000000 34.9750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral