メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.046294673395 42.9142170080956, 143.047054877598 42.9142712237863, 143.046865740178 42.9157291169215, 143.046099542646 42.9156678367615, 143.045325712878 42.9156160249705, 143.045514892804 42.9141585581035, 143.046294673395 42.9142170080956)) ^^http://www.opengis.net/ont/geosparql#wktLiteral