メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.768920713475 43.1983243433234, 141.767998022791 43.1978650161798, 141.767970351071 43.1978511157834, 141.768599504479 43.1971897969332, 141.769326240567 43.1964450527808, 141.770254513837 43.1969018606723, 141.769765062241 43.1974333168917, 141.769378529143 43.1978208186863, 141.768920713475 43.1983243433234)) ^^http://www.opengis.net/ont/geosparql#wktLiteral