メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.361839384176 43.7673355425389, 142.362136735613 43.7678775150607, 142.360686297635 43.768303394877, 142.360380818698 43.7677677555188, 142.360372540802 43.767752539949, 142.360082111226 43.7672184318974, 142.361529136529 43.7667700233932, 142.361839384176 43.7673355425389)) ^^http://www.opengis.net/ont/geosparql#wktLiteral