メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.032119918612 42.9170702110584, 143.030782783465 42.9169682677003, 143.030965747581 42.9157454946409, 143.032322589442 42.9158378060573, 143.032119918612 42.9170702110584)) ^^http://www.opengis.net/ont/geosparql#wktLiteral