メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1625000 39.2958334, 141.1687500 39.2958334, 141.1687500 39.3000000, 141.1625000 39.3000000, 141.1625000 39.2958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral