メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.030965747581 42.9157454946409, 143.028605996162 42.9155850082682, 143.028764206409 42.9143730976423, 143.031144730713 42.9145491928943, 143.030965747581 42.9157454946409)) ^^http://www.opengis.net/ont/geosparql#wktLiteral