メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1812500 34.1166667, 131.1875000 34.1166667, 131.1875000 34.1208334, 131.1812500 34.1208334, 131.1812500 34.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral