| u = URI -> return_term loc (Ast.Uri (u, None))
| r = NREF -> return_term loc (Ast.NRef (NReference.reference_of_string r))
| n = NUMBER -> return_term loc (Ast.Num (n, 0))
| u = URI -> return_term loc (Ast.Uri (u, None))
| r = NREF -> return_term loc (Ast.NRef (NReference.reference_of_string r))
| n = NUMBER -> return_term loc (Ast.Num (n, 0))