メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.9750000 37.0291667, 137.9812500 37.0291667, 137.9812500 37.0333333, 137.9750000 37.0333333, 137.9750000 37.0291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral