メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.9937500 38.8916667, 140.0000000 38.8916667, 140.0000000 38.8958334, 139.9937500 38.8958334, 139.9937500 38.8916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral