メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.746469664384 43.1600167675369, 141.746515625647 43.1604568888128, 141.74563042501 43.1600207301907, 141.745468068821 43.158839933744, 141.74631347311 43.1587852205408, 141.746371736157 43.1592304600983, 141.746431716926 43.159653623561, 141.746469664384 43.1600167675369)) ^^http://www.opengis.net/ont/geosparql#wktLiteral