メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5937500 32.9833333, 131.6000000 32.9833333, 131.6000000 32.9875000, 131.5937500 32.9875000, 131.5937500 32.9833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral