メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.126504238524 42.9852576913951, 144.125815458267 42.9860695399462, 144.122401722087 42.9850773392962, 144.123068666852 42.9843403468948, 144.124373839647 42.9846972745198, 144.125280180877 42.9849418676851, 144.126504238524 42.9852576913951)) ^^http://www.opengis.net/ont/geosparql#wktLiteral