メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.910292154741 43.4989708517905, 141.909379131702 43.4990999240452, 141.909014606648 43.4979173522749, 141.909920015471 43.4978252869551, 141.909965784244 43.4979661463448, 141.910292154741 43.4989708517905)) ^^http://www.opengis.net/ont/geosparql#wktLiteral