メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.257005216293 44.0236300005373, 144.25661415413 44.0241872078823, 144.255272585473 44.0230704510126, 144.255184381361 44.0229920952875, 144.255898761668 44.0225959905676, 144.257033130858 44.0235851173155, 144.257005216293 44.0236300005373)) ^^http://www.opengis.net/ont/geosparql#wktLiteral