メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2000000 36.1958334, 136.2062500 36.1958334, 136.2062500 36.2000000, 136.2000000 36.2000000, 136.2000000 36.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral