メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.6062500 34.6750000, 137.6125000 34.6750000, 137.6125000 34.6791667, 137.6062500 34.6791667, 137.6062500 34.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral