メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.770289916437 43.1940251709264, 141.769743947168 43.1945657424368, 141.769446096511 43.1944018231521, 141.768812152997 43.194060529317, 141.769307380731 43.1935376855783, 141.770289916437 43.1940251709264)) ^^http://www.opengis.net/ont/geosparql#wktLiteral