メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0000000 38.9250000, 140.0062500 38.9250000, 140.0062500 38.9291667, 140.0000000 38.9291667, 140.0000000 38.9250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral