メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4625000 32.0083333, 131.4687500 32.0083333, 131.4687500 32.0125000, 131.4625000 32.0125000, 131.4625000 32.0083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral