メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.393808480586 43.7412792174617, 142.39385878811 43.7417132141518, 142.39256680993 43.7417862467777, 142.39183009914 43.7418325481583, 142.391613740157 43.7398558892243, 142.392195134747 43.7396143771068, 142.3936651652 43.7390037113865, 142.393686054658 43.7393043437473, 142.393788345249 43.7407764981913, 142.393808480586 43.7412792174617)) ^^http://www.opengis.net/ont/geosparql#wktLiteral