メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38024904432 43.7715951586992, 142.379255660339 43.7714415286239, 142.379019289377 43.7714049782313, 142.378295990813 43.7715185259861, 142.377982936388 43.7709228757938, 142.379543055677 43.7704783221844, 142.38024904432 43.7715951586992)) ^^http://www.opengis.net/ont/geosparql#wktLiteral