メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.753503244686 43.1999081352521, 141.753265599642 43.2001639437202, 141.752682229916 43.2007549114732, 141.751800979021 43.2002225652054, 141.752602353777 43.1994216337226, 141.753503244686 43.1999081352521)) ^^http://www.opengis.net/ont/geosparql#wktLiteral