メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763316129296 43.1844623566453, 141.763817564092 43.1847232274652, 141.762920766512 43.1856653922222, 141.762561410348 43.1860658548177, 141.761856786391 43.1868093795531, 141.761323216653 43.1865396437201, 141.760938175038 43.1863439625892, 141.760917835032 43.1863336079343, 141.761633792671 43.1856096880696, 141.762915987277 43.1842568407744, 141.763316129296 43.1844623566453)) ^^http://www.opengis.net/ont/geosparql#wktLiteral