メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.414571159935 43.8344952579796, 142.412912321179 43.8332938095108, 142.415338721157 43.8315389652417, 142.417018057182 43.8327275147345, 142.414571159935 43.8344952579796)) ^^http://www.opengis.net/ont/geosparql#wktLiteral