メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.3000000 38.8958334, 141.3062500 38.8958334, 141.3062500 38.9000000, 141.3000000 38.9000000, 141.3000000 38.8958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral