メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5375000 32.2500000, 131.5437500 32.2500000, 131.5437500 32.2541667, 131.5375000 32.2541667, 131.5375000 32.2500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral