メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.050446874628 42.9226265964027, 143.050404741608 42.9226247101837, 143.049292270806 42.9225526452604, 143.049416585396 42.9214498868536, 143.049485699809 42.9208373049705, 143.050711497952 42.9209282688175, 143.050741864983 42.920930658412, 143.050446874628 42.9226265964027)) ^^http://www.opengis.net/ont/geosparql#wktLiteral