メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.921145156777 43.4927057885732, 141.920112039365 43.4928642093272, 141.920079988681 43.4928696024621, 141.91835649111 43.493159386519, 141.91805962044 43.4920588614206, 141.918051363923 43.4920188217141, 141.919752048519 43.4917930096626, 141.92144164374 43.4915347536175, 141.921764689606 43.4926107637585, 141.921145156777 43.4927057885732)) ^^http://www.opengis.net/ont/geosparql#wktLiteral