メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.402137362919 44.1787870898471, 142.401298181942 44.1786223782501, 142.401467445722 44.1780098052864, 142.401676403786 44.1773518080767, 142.40273986857 44.1775148827341, 142.402472046963 44.1780803883639, 142.402137362919 44.1787870898471)) ^^http://www.opengis.net/ont/geosparql#wktLiteral