メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.4375000 35.3958334, 139.4437500 35.3958334, 139.4437500 35.4000000, 139.4375000 35.4000000, 139.4375000 35.3958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral