メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1625000 34.3166667, 135.1687500 34.3166667, 135.1687500 34.3208334, 135.1625000 34.3208334, 135.1625000 34.3166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral