メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.5375000 34.9291667, 137.5437500 34.9291667, 137.5437500 34.9333333, 137.5375000 34.9333333, 137.5375000 34.9291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral