メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.88414449661 43.3328882989479, 141.880229890564 43.3329925079005, 141.880138031838 43.3326472519742, 141.879880647205 43.3318206279092, 141.882993939206 43.3317936280757, 141.883895728253 43.3317890487306, 141.884091406853 43.3326208823047, 141.88414449661 43.3328882989479)) ^^http://www.opengis.net/ont/geosparql#wktLiteral