メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1000000 33.1208334, 131.1062500 33.1208334, 131.1062500 33.1250000, 131.1000000 33.1250000, 131.1000000 33.1208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral