メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.392238030025 43.0526084163519, 141.39128928049 43.0532692994981, 141.390560702364 43.0537792106946, 141.389987200867 43.0533330901717, 141.389707278657 43.0531123316372, 141.38936487422 43.0528541791666, 141.389782645837 43.0525499761354, 141.390081344794 43.0523460837502, 141.390475895159 43.0520767279634, 141.391057052928 43.0516705707898, 141.391660401835 43.0521497133859, 141.392238030025 43.0526084163519)) ^^http://www.opengis.net/ont/geosparql#wktLiteral