メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.712280490996 44.3677283111317, 141.711675835202 44.3681254011586, 141.710641942333 44.3672599493138, 141.711233332368 44.3668823829886, 141.712280490996 44.3677283111317)) ^^http://www.opengis.net/ont/geosparql#wktLiteral