メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.900869598928 43.4737305027095, 141.901143620201 43.4746989632797, 141.900526734502 43.4747910078712, 141.90024568516 43.4738200986264, 141.899843238501 43.4724717387472, 141.900485915652 43.4723743967121, 141.900862691328 43.473706079499, 141.900869598928 43.4737305027095)) ^^http://www.opengis.net/ont/geosparql#wktLiteral