メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.392367551216 44.1758759780036, 142.39119099839 44.1756942716318, 142.39146366423 44.1747953070274, 142.392638217728 44.1749857671298, 142.392612608271 44.175066276259, 142.392367551216 44.1758759780036)) ^^http://www.opengis.net/ont/geosparql#wktLiteral