メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.582259470158 38.9127913709727, 141.582867866384 38.9128278605742, 141.583599496416 38.9128727736718, 141.583529459714 38.9139615077675, 141.583461311542 38.9150329158327, 141.582942209298 38.915166738223, 141.58225242651 38.915329524547, 141.581889686991 38.9139083511803, 141.581594226282 38.9128313234737, 141.581537994802 38.9127696094401, 141.581675107189 38.9127702782646, 141.582259470158 38.9127913709727)) ^^http://www.opengis.net/ont/geosparql#wktLiteral