メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.754417880434 43.187293469074, 141.752929000048 43.1888198863418, 141.751804779153 43.1885688526662, 141.752603762448 43.1876926610485, 141.753349502505 43.1868490061646, 141.754134583495 43.1871756375192, 141.754417880434 43.187293469074)) ^^http://www.opengis.net/ont/geosparql#wktLiteral