メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6375000 33.2375000, 131.6437500 33.2375000, 131.6437500 33.2416667, 131.6375000 33.2416667, 131.6375000 33.2375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral