メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.371984404511 43.0855125874539, 141.371808755721 43.0862069297504, 141.371229988075 43.0861315281533, 141.370634833981 43.0860480489542, 141.370798535308 43.0853578354887, 141.370900557564 43.0849139294885, 141.372091256664 43.0850725852092, 141.371984404511 43.0855125874539)) ^^http://www.opengis.net/ont/geosparql#wktLiteral