メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.331569603069 43.0519855148712, 141.331539604929 43.0522026631995, 141.331511518187 43.0524331887927, 141.329814988461 43.0523334001015, 141.329843112279 43.0520880352707, 141.329896140325 43.0517100895292, 141.329899806118 43.0516573716583, 141.331599036667 43.0517611890509, 141.331569603069 43.0519855148712)) ^^http://www.opengis.net/ont/geosparql#wktLiteral