メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.043325507759 42.9139916997426, 143.04405776056 42.9140489480009, 143.043848635966 42.9155055657927, 143.043104071116 42.9154448148135, 143.042441818559 42.9153967826138, 143.042639585666 42.9140404688075, 143.042660734762 42.9139400293371, 143.043325507759 42.9139916997426)) ^^http://www.opengis.net/ont/geosparql#wktLiteral