メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1875000 32.7750000, 131.1937500 32.7750000, 131.1937500 32.7791667, 131.1875000 32.7791667, 131.1875000 32.7750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral