メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.886097026316 43.3416784931587, 141.886441519844 43.3433674821369, 141.883031626951 43.3429885939381, 141.882913261144 43.3425522457798, 141.883781086822 43.3417599613962, 141.884106823931 43.3414630151939, 141.885766600527 43.3399526265893, 141.886097026316 43.3416784931587)) ^^http://www.opengis.net/ont/geosparql#wktLiteral