メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6687500 33.4083333, 131.6750000 33.4083333, 131.6750000 33.4125000, 131.6687500 33.4125000, 131.6687500 33.4083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral