メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.348635895208 43.0677426249729, 141.348458330749 43.0677430536136, 141.347753958894 43.0675921978705, 141.347109964843 43.0674780339208, 141.347408711186 43.0663315589119, 141.348979151457 43.0665548612767, 141.348635895208 43.0677426249729)) ^^http://www.opengis.net/ont/geosparql#wktLiteral