メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.909379131702 43.4990999240452, 141.908540963369 43.4992183482707, 141.908195720635 43.4980421647421, 141.909014606648 43.4979173522749, 141.909379131702 43.4990999240452)) ^^http://www.opengis.net/ont/geosparql#wktLiteral