メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.577686506667 43.3290368605709, 145.577131372181 43.3294402687397, 145.57662323917 43.32985074542, 145.576064981033 43.3294500009308, 145.575545626624 43.3290630305707, 145.576074496906 43.3286582845425, 145.576612401663 43.3282638905682, 145.577686506667 43.3290368605709)) ^^http://www.opengis.net/ont/geosparql#wktLiteral