メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.40791172638 44.1798595954941, 142.405854562304 44.1784844436214, 142.405991331436 44.1780349378447, 142.407890153748 44.1778574953157, 142.408462380696 44.1782152117392, 142.40900967948 44.1785789530686, 142.409264061007 44.1787684498421, 142.40791172638 44.1798595954941)) ^^http://www.opengis.net/ont/geosparql#wktLiteral