メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4187500 40.5375000, 140.4250000 40.5375000, 140.4250000 40.5416667, 140.4187500 40.5416667, 140.4187500 40.5375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral