メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9812500 37.0750000, 137.9875000 37.0750000, 137.9875000 37.0791667, 137.9812500 37.0791667, 137.9812500 37.0750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral