メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.26629425256 44.0268864119081, 144.266208407933 44.0269011324528, 144.266153026901 44.0268889093829, 144.264897436196 44.0264754420396, 144.264924796656 44.0264315740035, 144.265213128087 44.0259908239776, 144.266766965854 44.02653197949, 144.26629425256 44.0268864119081)) ^^http://www.opengis.net/ont/geosparql#wktLiteral