メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.144761338908 38.9272787253009, 141.143996424626 38.9281307495201, 141.142781377484 38.9274630996831, 141.141824386173 38.9269312962149, 141.142581765052 38.9260734647704, 141.143438868081 38.9265424656958, 141.144761338908 38.9272787253009)) ^^http://www.opengis.net/ont/geosparql#wktLiteral