メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.980508072587 34.6782659644899, 137.979307150507 34.6784518531419, 137.979060727244 34.6773167508006, 137.980260491127 34.6771294510067, 137.980508072587 34.6782659644899)) ^^http://www.opengis.net/ont/geosparql#wktLiteral