メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0437500 32.9833333, 131.0500000 32.9833333, 131.0500000 32.9875000, 131.0437500 32.9875000, 131.0437500 32.9833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral