メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4437500 34.5125000, 136.4500000 34.5125000, 136.4500000 34.5166667, 136.4437500 34.5166667, 136.4437500 34.5125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral