メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.397475778451 44.1860398362403, 142.39644466788 44.1858982779967, 142.396705159591 44.1850495975154, 142.397194790962 44.1851294978903, 142.397683387616 44.1852092408757, 142.397475778451 44.1860398362403)) ^^http://www.opengis.net/ont/geosparql#wktLiteral