メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.396170307286 44.1867567854268, 142.395105245641 44.1865860370678, 142.394158951972 44.1864384750062, 142.394344128038 44.1857959220865, 142.396373690147 44.1861295151917, 142.396170307286 44.1867567854268)) ^^http://www.opengis.net/ont/geosparql#wktLiteral