メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.906474456418 43.486351583086, 141.905703527957 43.4864873265778, 141.905347626603 43.4852898445882, 141.906162080029 43.4851664712813, 141.906474456418 43.486351583086)) ^^http://www.opengis.net/ont/geosparql#wktLiteral