メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.286788249872 38.6562820582898, 141.285291435862 38.6566779057604, 141.284777868395 38.6568134728599, 141.284125933535 38.6553281905831, 141.283940125415 38.6550128767366, 141.28393329297 38.6549969962733, 141.284438270536 38.6548390836083, 141.285962080889 38.654445677602, 141.286788249872 38.6562820582898)) ^^http://www.opengis.net/ont/geosparql#wktLiteral