メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.8062500 43.9000000, 141.8125000 43.9000000, 141.8125000 43.9041667, 141.8062500 43.9041667, 141.8062500 43.9000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral