メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.3000000 33.3875000, 131.3062500 33.3875000, 131.3062500 33.3916667, 131.3000000 33.3916667, 131.3000000 33.3875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral