メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.594545660932 42.6289810448248, 141.594566765275 42.6289938256691, 141.595117601378 42.6293279786936, 141.595793035164 42.629733177299, 141.595324339156 42.6302131425898, 141.594855746071 42.630723350043, 141.594064406944 42.6304118725925, 141.593323790768 42.6301141844751, 141.592528149292 42.629778757525, 141.59296558402 42.6292575495318, 141.593650956902 42.6284444603291, 141.593847143511 42.6285720454601, 141.593857404835 42.6285787196711, 141.59414422188 42.6287400465819, 141.5941697045 42.6287543794864, 141.594545660932 42.6289810448248)) ^^http://www.opengis.net/ont/geosparql#wktLiteral