メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.2500000 43.7541667, 142.2562500 43.7541667, 142.2562500 43.7583333, 142.2500000 43.7583333, 142.2500000 43.7541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral