メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4062500 34.1375000, 131.4125000 34.1375000, 131.4125000 34.1416667, 131.4062500 34.1416667, 131.4062500 34.1375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral