メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906848731573 43.4804067658467, 141.907013681225 43.4810675372566, 141.906975060688 43.4810743136415, 141.906057133932 43.4812351830021, 141.905850944674 43.480542815407, 141.905737476677 43.4801618435027, 141.905709340347 43.4800663984331, 141.906687251825 43.4799214296887, 141.9066911831 43.4799348033541, 141.906708388673 43.4799322532769, 141.906848731573 43.4804067658467)) ^^http://www.opengis.net/ont/geosparql#wktLiteral