メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.332434618553 43.7644208795334, 142.331671512945 43.764178379624, 142.332299977786 43.763103630399, 142.333067077617 43.7633345552591, 142.33302681039 43.7633955185471, 142.332899343172 43.7636320481704, 142.332434618553 43.7644208795334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral