メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.679875664134 42.8137578328975, 141.68004605577 42.8142197903005, 141.680298116213 42.8147198540917, 141.68061126394 42.8152731116789, 141.682546275271 42.8178537135439, 141.678705572883 42.819191751943, 141.677163647613 42.8146514511479, 141.679875664134 42.8137578328975)) ^^http://www.opengis.net/ont/geosparql#wktLiteral