メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.107060164855 43.8257266390609, 144.105630599265 43.8261709076517, 144.105122504578 43.8252396953331, 144.105837275723 43.8250174351502, 144.106540712679 43.8248119146637, 144.107060164855 43.8257266390609)) ^^http://www.opengis.net/ont/geosparql#wktLiteral