Hi Noushin,
if you like to customize the layout of a specific application, then it is not necessary to change the xsl template pages. Just change the layout of the JavaServer Pages directly. But, if you regenerate the application by the generator all you changes will be overwritten.
If you are intending to change the layout for all new applications generated by the generator then it is reasonable to modify the xml template pages. Now, all the new generated applications will show your modifications.
Hope this will help you
Regards Thorsten
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