メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6187500 39.4333333, 140.6250000 39.4333333, 140.6250000 39.4375000, 140.6187500 39.4375000, 140.6187500 39.4333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral