メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1875000 33.9500000, 131.1937500 33.9500000, 131.1937500 33.9541667, 131.1875000 33.9541667, 131.1875000 33.9500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral