メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.886250734637 43.0198595119084, 142.885999800065 43.0197064598593, 142.885476938544 43.0193899216384, 142.886373687535 43.0186012719468, 142.887048572886 43.0190023429864, 142.887158140774 43.0190685477081, 142.886250734637 43.0198595119084)) ^^http://www.opengis.net/ont/geosparql#wktLiteral