メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.363417633642 43.7668990424888, 142.363700980163 43.7674179599807, 142.362136735613 43.7678775150607, 142.361839384176 43.7673355425389, 142.361529136529 43.7667700233932, 142.363104985246 43.7663264626859, 142.363417633642 43.7668990424888)) ^^http://www.opengis.net/ont/geosparql#wktLiteral