メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.412140475011 43.8362826826127, 142.410469068527 43.8350963115883, 142.412912321179 43.8332938095108, 142.414571159935 43.8344952579796, 142.412140475011 43.8362826826127)) ^^http://www.opengis.net/ont/geosparql#wktLiteral