メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9187500 37.4333333, 139.9250000 37.4333333, 139.9250000 37.4375000, 139.9187500 37.4375000, 139.9187500 37.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral