メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.0062500 39.6250000, 142.0125000 39.6250000, 142.0125000 39.6291667, 142.0062500 39.6291667, 142.0062500 39.6250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral