メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.759401403435 43.1967087212118, 141.758766670184 43.1973819930667, 141.758482828908 43.1976728504415, 141.758041000763 43.1974718535262, 141.758009062612 43.1974987926211, 141.757415957477 43.1972232999803, 141.757762810584 43.1968609123627, 141.758389445971 43.1961977348288, 141.759401403435 43.1967087212118)) ^^http://www.opengis.net/ont/geosparql#wktLiteral