メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9875000 33.7833333, 131.9937500 33.7833333, 131.9937500 33.7875000, 131.9875000 33.7875000, 131.9875000 33.7833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral