メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.91383262764 43.5143004004162, 141.912964554704 43.5144358603617, 141.91279125617 43.5139003442097, 141.912545989317 43.5131166812442, 141.913436770494 43.5129688790376, 141.913784596495 43.5141371732127, 141.91383262764 43.5143004004162)) ^^http://www.opengis.net/ont/geosparql#wktLiteral