メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5437500 33.3833333, 131.5500000 33.3833333, 131.5500000 33.3875000, 131.5437500 33.3875000, 131.5437500 33.3833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral