メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.91322560558 43.5122585624963, 141.913369929825 43.5127440962935, 141.913436770494 43.5129688790376, 141.912545989317 43.5131166812442, 141.912480721521 43.5128960162264, 141.912332246861 43.5123936965936, 141.91205389242 43.5114729371951, 141.912939846098 43.5113381370857, 141.913157937183 43.5120310000287, 141.91322560558 43.5122585624963)) ^^http://www.opengis.net/ont/geosparql#wktLiteral