メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2750000 36.0791667, 137.2812500 36.0791667, 137.2812500 36.0833333, 137.2750000 36.0833333, 137.2750000 36.0791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral