メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.362688478062 43.7755523354613, 142.362680337836 43.7755660376031, 142.362067823946 43.7753622779847, 142.362428566629 43.7747449332567, 142.362457936132 43.7747525521057, 142.362608054756 43.7747914873727, 142.363051687491 43.7749401543801, 142.362688478062 43.7755523354613)) ^^http://www.opengis.net/ont/geosparql#wktLiteral