メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5000000 33.2875000, 131.5062500 33.2875000, 131.5062500 33.2916667, 131.5000000 33.2916667, 131.5000000 33.2875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral