メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.137785543369 42.9767675265525, 144.135009927605 42.9754842191764, 144.136809985004 42.9734612881211, 144.137844221551 42.9738830079512, 144.139721060717 42.9745035480107, 144.138312927593 42.9761298024836, 144.137785543369 42.9767675265525)) ^^http://www.opengis.net/ont/geosparql#wktLiteral