メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.103659790381 43.824237053585, 144.102931215184 43.8244589796841, 144.102348371868 43.8234203950077, 144.103805301 43.8229829314457, 144.104402979784 43.824010613543, 144.103659790381 43.824237053585)) ^^http://www.opengis.net/ont/geosparql#wktLiteral