メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2562500 40.8333333, 141.2625000 40.8333333, 141.2625000 40.8375000, 141.2562500 40.8375000, 141.2562500 40.8333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral