メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.752602353777 43.1994216337226, 141.751800979021 43.2002225652054, 141.751353732334 43.1998848713687, 141.751026503724 43.1995892654575, 141.751674439793 43.1989440123683, 141.752602353777 43.1994216337226)) ^^http://www.opengis.net/ont/geosparql#wktLiteral