メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.903008944809 43.4847585770428, 141.903162478884 43.4852583795217, 141.90315776667 43.4852840692771, 141.902529007089 43.4853533402837, 141.902223283159 43.484867491857, 141.90185759551 43.484476188091, 141.902158340135 43.4844522736839, 141.902874058988 43.4843374862687, 141.902920190737 43.4844814750444, 141.903008944809 43.4847585770428)) ^^http://www.opengis.net/ont/geosparql#wktLiteral