メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0625000 39.4333333, 141.0687500 39.4333333, 141.0687500 39.4375000, 141.0625000 39.4375000, 141.0625000 39.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral