メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.755198085297 43.1923667950554, 141.754479946261 43.1931199282607, 141.754039504788 43.1929079525922, 141.753913681582 43.1928486130306, 141.75354774322 43.1926536953807, 141.754292891589 43.1919013175092, 141.754902376528 43.1912470197407, 141.75493123581 43.1912558647235, 141.755291801554 43.1914430888209, 141.755823331598 43.1917178349499, 141.755198085297 43.1923667950554)) ^^http://www.opengis.net/ont/geosparql#wktLiteral