メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.345713172233 44.4864549089712, 142.345089484681 44.4862930065594, 142.344880139176 44.4862367193256, 142.345114655661 44.4857367426019, 142.345945572898 44.4859473399684, 142.345713172233 44.4864549089712)) ^^http://www.opengis.net/ont/geosparql#wktLiteral