メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.378149578489 43.0786195652729, 141.37731692635 43.0785089257845, 141.377442029919 43.0779494275616, 141.377561652536 43.0773838386977, 141.378380537861 43.0774902928029, 141.378149578489 43.0786195652729)) ^^http://www.opengis.net/ont/geosparql#wktLiteral