メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.761423272252 43.1872574160138, 141.760947111723 43.1877735566297, 141.760928871906 43.1877649690572, 141.760493435427 43.1875602797416, 141.760508604735 43.1875443103585, 141.760015329791 43.1873016055526, 141.760938175038 43.1863439625892, 141.761323216653 43.1865396437201, 141.761856786391 43.1868093795531, 141.761423272252 43.1872574160138)) ^^http://www.opengis.net/ont/geosparql#wktLiteral