メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.106540712679 43.8248119146637, 144.105837275723 43.8250174351502, 144.105122504578 43.8252396953331, 144.105104996103 43.8252075621667, 144.104402979784 43.824010613543, 144.105833572787 43.8235883359666, 144.10651029734 43.8247582453991, 144.106540712679 43.8248119146637)) ^^http://www.opengis.net/ont/geosparql#wktLiteral