メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.354821700351 31.6251749219459, 131.355822873571 31.6253287309833, 131.355570077066 31.6262032335273, 131.355561744332 31.6262318658914, 131.355371964883 31.6269166345792, 131.355178798252 31.6275556080741, 131.354263097477 31.6271869107678, 131.352894364705 31.6265760581448, 131.352609726384 31.6264717015325, 131.352207819842 31.6263469491388, 131.352374899847 31.6257631595294, 131.352619381318 31.6248379525888, 131.354821700351 31.6251749219459)) ^^http://www.opengis.net/ont/geosparql#wktLiteral