メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.385584525171 42.9834686621073, 144.383985339481 42.9831824818139, 144.384163413796 42.9825988183311, 144.385772436172 42.9828763049447, 144.385584525171 42.9834686621073)) ^^http://www.opengis.net/ont/geosparql#wktLiteral