メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.770957456689 43.1972816239802, 141.770189862462 43.1980590488685, 141.770386953848 43.1981600220719, 141.76979893026 43.1987936033885, 141.768920713475 43.1983243433234, 141.769378529143 43.1978208186863, 141.769765062241 43.1974333168917, 141.770254513837 43.1969018606723, 141.77083864158 43.1972202929505, 141.770957456689 43.1972816239802)) ^^http://www.opengis.net/ont/geosparql#wktLiteral