メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0562500 36.5583333, 139.0625000 36.5583333, 139.0625000 36.5625000, 139.0562500 36.5625000, 139.0562500 36.5583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral