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        Fri, 11 Sep 2015 01:21:43 -0700 (PDT)
Date: Fri, 11 Sep 2015 10:21:38 +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] Notice to developers: layers have now a type.
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On Thu, 10 Sep 2015 18:01:33 -0400
DJ Delorie <dj AT delorie DOT com> wrote:

> 
> > Does this mean that you can now draw voids in the mask layer?
> 
> While this does technically allow the pcb file to have a layer type
> LT_MASK that would serve this purpose, that does not mean that the
> rest of the code in pcb is expecting such a layer.  It would be an
> independent task to add such support to the various exporters, if
> you're interested.
> 
> In addition, the GUI does not yet have any way to change the type of a
> layer after it's loaded.  You'll have to hack the file to change it.

Sometimes it could be useful to add objects to an extra layer for example to mark the region for conformal coating or add some comments/documentation. As far as I can tell from a fast look into a *.pcb file lines/pins/ElementLine/... any drawing object could be put on any layer which give very good flexibility for the future.