メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.6000000 34.4333333, 136.6062500 34.4333333, 136.6062500 34.4375000, 136.6000000 34.4375000, 136.6000000 34.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral