メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.1875000 27.1041667, 142.1937500 27.1041667, 142.1937500 27.1083333, 142.1875000 27.1083333, 142.1875000 27.1041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral