メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.325946455904 39.60746433828, 140.326731461082 39.6077494771624, 140.327716562115 39.6080683915286, 140.32757727221 39.6082996570405, 140.327242625052 39.6089249600121, 140.325988329982 39.6085154387799, 140.325946455904 39.60746433828)) ^^http://www.opengis.net/ont/geosparql#wktLiteral