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	Mon, 21 Sep 2015 07:53:55 -0700 (PDT)
Date:	Mon, 21 Sep 2015 16:53:54 +0200
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject:	Re: [geda-user] Apollon the technical thread
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> > Yes, but you don't know if there is a user written backend.
> 
> We're talking about layer types in pcb here and pcb has no backends.
> 

If some part of pcb use an attribute in sort of it is a backend. It could for example be useful to add an attribute to tell the thickness of layer, this may be used for example for calculation of trace impendances or manufacturing specification.

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