メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.2000000 35.1958334, 137.2062500 35.1958334, 137.2062500 35.2000000, 137.2000000 35.2000000, 137.2000000 35.1958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral