メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351216686803 43.7736032686707, 142.351251651324 43.7735913529417, 142.351497442522 43.7740340124438, 142.351083768132 43.7741465662358, 142.350091336133 43.7744205141675, 142.349868168367 43.774015716665, 142.349623321363 43.7736069989152, 142.351021447467 43.7731878820195, 142.351216686803 43.7736032686707)) ^^http://www.opengis.net/ont/geosparql#wktLiteral