メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6437500 37.6208334, 140.6500000 37.6208334, 140.6500000 37.6250000, 140.6437500 37.6250000, 140.6437500 37.6208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral