メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0000000 30.7416667, 131.0062500 30.7416667, 131.0062500 30.7458334, 131.0000000 30.7458334, 131.0000000 30.7416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral