Build 3.5.0.88 of xlsgen adds read, write and calc support for reduced same-sheet references.

Reduced same-sheet references are formulas of the form =!$C$5, that is a cell or area reference without a sheet name before the exclamation point. Excel allows the use of such formulas in defined names.

What they allow is to create indirections with less constraint than fully qualified cell or area references.

xlsgen brings full support for it.