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> > Design rules: for example my PCB manufacturer wants minimal silk screen
> > of 0.15mm, but for the copper I have choice of 0.15, 0.125, 0.1mm
> > 
> Same here.
> This is a common use case for different design rules on different layers. 
> A less common but still happening occurrence is extra thick copper for 
> inner layers. These inner layers need to obey larger minimum spacing rules 
> than regular 35 µm on the outside.
> 
> A redesign of the file format should allow for this kind of diversity.

One more agree.