メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4437500 37.4958334, 140.4500000 37.4958334, 140.4500000 37.5000000, 140.4437500 37.5000000, 140.4437500 37.4958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral