メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.262906120531 43.1978989851254, 144.261054532185 43.1977697353685, 144.261341047894 43.1971340238708, 144.261990145691 43.1958905156931, 144.262010768411 43.1958511229457, 144.262977449512 43.1956079501899, 144.26291977912 43.1974609020459, 144.262906120531 43.1978989851254)) ^^http://www.opengis.net/ont/geosparql#wktLiteral