メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.945406869148 42.9424959146779, 142.944512943792 42.9430319125991, 142.944478667094 42.9430527267389, 142.944232861502 42.9428345023219, 142.94350399511 42.9421516398364, 142.943531049819 42.94213565175, 142.943838743878 42.9419542343357, 142.943891999131 42.9419228258192, 142.944433009549 42.9416036215168, 142.945406869148 42.9424959146779)) ^^http://www.opengis.net/ont/geosparql#wktLiteral