メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.39280631909 43.0544288758132, 141.39265690822 43.0545317752111, 141.392052964162 43.0549478246642, 141.391053827861 43.0541988439577, 141.390560702364 43.0537792106946, 141.39128928049 43.0532692994981, 141.392238030025 43.0526084163519, 141.393745091561 43.0537820427493, 141.39280631909 43.0544288758132)) ^^http://www.opengis.net/ont/geosparql#wktLiteral