メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.778243727983 43.2002463162889, 141.778555220819 43.2003993654246, 141.779070436679 43.2016483266731, 141.778796352629 43.2014547138163, 141.778753209091 43.2014270382756, 141.778053720648 43.2009791971414, 141.777735681125 43.200789621135, 141.778243727983 43.2002463162889)) ^^http://www.opengis.net/ont/geosparql#wktLiteral