メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763064051433 43.2063753339127, 141.762682536878 43.2071396818779, 141.761990208571 43.2068206363085, 141.762501195413 43.2062317798653, 141.762502658079 43.206232311811, 141.762529430763 43.2061966554118, 141.763064051433 43.2063753339127)) ^^http://www.opengis.net/ont/geosparql#wktLiteral