メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.1625000 33.1916667, 130.1687500 33.1916667, 130.1687500 33.1958334, 130.1625000 33.1958334, 130.1625000 33.1916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral