メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.702111985525 44.3743368714495, 141.705853094143 44.3718577766439, 141.706957659481 44.3727350591015, 141.704394596395 44.3744147082936, 141.703726070034 44.3734860211696, 141.702230845281 44.3744319462517, 141.702111985525 44.3743368714495)) ^^http://www.opengis.net/ont/geosparql#wktLiteral