メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.905197105822 43.484948142408, 141.904305089785 43.4850812971475, 141.904061165397 43.4842467226746, 141.904953169071 43.4841135708104, 141.905197105822 43.484948142408)) ^^http://www.opengis.net/ont/geosparql#wktLiteral