メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.379303966566 43.0792953482945, 141.37801344848 43.0794622658245, 141.378072343689 43.0789502971673, 141.378149578489 43.0786195652729, 141.378992630739 43.0787074214718, 141.3802074292 43.0785407620254, 141.380639721135 43.0791044259353, 141.379303966566 43.0792953482945)) ^^http://www.opengis.net/ont/geosparql#wktLiteral