メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.709612558327 44.3694476955695, 141.708586419796 44.3700982858664, 141.707514510345 44.3692752826602, 141.707496842325 44.3692618744571, 141.707518671345 44.3692492863057, 141.708066842844 44.3689336185909, 141.70850982582 44.3686235264635, 141.708549931113 44.3685954507546, 141.709650327262 44.3694231945313, 141.709612558327 44.3694476955695)) ^^http://www.opengis.net/ont/geosparql#wktLiteral