メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.349798537364 43.7769248061425, 142.350642356461 43.7783978558981, 142.349161073748 43.7787640820477, 142.348386537503 43.7773060578459, 142.348171667276 43.7769155076499, 142.349592033129 43.7765144392286, 142.349798537364 43.7769248061425)) ^^http://www.opengis.net/ont/geosparql#wktLiteral