メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398121587858 44.1852807485559, 142.397683387616 44.1852092408757, 142.397194790962 44.1851294978903, 142.397433122223 44.1843824684892, 142.397720781009 44.1844334633154, 142.397913871909 44.1844677037693, 142.398370962699 44.1845487500573, 142.398121587858 44.1852807485559)) ^^http://www.opengis.net/ont/geosparql#wktLiteral