メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.350914825388 43.1119650466305, 141.35054090166 43.1119159930794, 141.350060330567 43.1118476795212, 141.349476122487 43.1117578075881, 141.349777818819 43.110503180539, 141.351227524233 43.1107117085579, 141.350914825388 43.1119650466305)) ^^http://www.opengis.net/ont/geosparql#wktLiteral