メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0000000 40.9166667, 141.0062500 40.9166667, 141.0062500 40.9208334, 141.0000000 40.9208334, 141.0000000 40.9166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral