メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6062500 32.3375000, 131.6125000 32.3375000, 131.6125000 32.3416667, 131.6062500 32.3416667, 131.6062500 32.3375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral