メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.767307644761 43.1985843759917, 141.766838926804 43.1983573483856, 141.766616243997 43.1982474695467, 141.767300614541 43.197516555095, 141.767970351071 43.1978511157834, 141.767998022791 43.1978650161798, 141.767307644761 43.1985843759917)) ^^http://www.opengis.net/ont/geosparql#wktLiteral