メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.405969228345 44.1780314343545, 142.40492039215 44.1778653298877, 142.404893229546 44.1778610409876, 142.405068851433 44.1774143314108, 142.405101427276 44.1774198424085, 142.405193884454 44.1771896593949, 142.405267718461 44.1772019188409, 142.406161856533 44.177350352999, 142.405969228345 44.1780314343545)) ^^http://www.opengis.net/ont/geosparql#wktLiteral