メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6437500 32.5583333, 131.6500000 32.5583333, 131.6500000 32.5625000, 131.6437500 32.5625000, 131.6437500 32.5583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral