メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.459325072875 43.7748631924648, 142.457868188612 43.7749259246663, 142.45573284419 43.775015797634, 142.455527410738 43.7730025103926, 142.457662564135 43.7728843068041, 142.459145770706 43.7728069590981, 142.459346273573 43.774862187093, 142.459325072875 43.7748631924648)) ^^http://www.opengis.net/ont/geosparql#wktLiteral