メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.348364993054 44.4837566591895, 142.347464873848 44.4835131304941, 142.348015022617 44.4823552408556, 142.34890355188 44.4825787713772, 142.348364993054 44.4837566591895)) ^^http://www.opengis.net/ont/geosparql#wktLiteral