メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.9812500 33.1875000, 128.9875000 33.1875000, 128.9875000 33.1916667, 128.9812500 33.1916667, 128.9812500 33.1875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral