メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.387507653041 42.9879253687933, 144.387430090206 42.9881692423358, 144.385874660314 42.9879056865427, 144.386029573869 42.9874225178659, 144.386747571343 42.9877356999824, 144.38687963253 42.9873009214169, 144.387661062801 42.9874434201492, 144.387507653041 42.9879253687933)) ^^http://www.opengis.net/ont/geosparql#wktLiteral