メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0750000 32.8458334, 131.0812500 32.8458334, 131.0812500 32.8500000, 131.0750000 32.8500000, 131.0750000 32.8458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral