メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.35524403342 43.7680131500704, 142.355552575999 43.7685430101711, 142.354012453849 43.7689876044916, 142.353734361704 43.7684608237531, 142.353728616835 43.768449946744, 142.353429611848 43.7679119852507, 142.354946817608 43.7674725896912, 142.35524403342 43.7680131500704)) ^^http://www.opengis.net/ont/geosparql#wktLiteral