メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.0437500 35.0833333, 135.0500000 35.0833333, 135.0500000 35.0875000, 135.0437500 35.0875000, 135.0437500 35.0833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral