メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.358900257251 43.7681955044078, 142.359164476587 43.7687460417478, 142.357635857865 43.7691847394223, 142.357326183628 43.7686461141383, 142.357028898871 43.7681202385573, 142.358594456506 43.7676410524994, 142.358900257251 43.7681955044078)) ^^http://www.opengis.net/ont/geosparql#wktLiteral