メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.711233332368 44.3668823829886, 141.710641942333 44.3672599493138, 141.707846032608 44.3649064974494, 141.707983094745 44.3647858899836, 141.708346243104 44.3645680937731, 141.710625458886 44.3663951326286, 141.711233332368 44.3668823829886)) ^^http://www.opengis.net/ont/geosparql#wktLiteral