There are two(or more) xml files.
They are related.
so If I have to modify <Label key="apple"> to <Label key="grape"> in a.xml ,
I have to modify <item>apple</item> to <item>grape</item> in b.xml too.
I find the way
I modify one place, find it the other file and replace it at the same time.
The purpose is to avoid human erros.
and my code