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        Mon, 21 Sep 2015 06:39:35 -0700 (PDT)
Date: Mon, 21 Sep 2015 15:39:29 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Apollon the technical thread
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> > Please note that users can define own layer types like mechanical
> > documentation, etc.
> 
> This doesn't make sense, because a layertype makes only sense if there's
> code handling it.
> 
> Before John chimes in: the same is true for geschem; some attribute
> makes only sense if the backend knows what to do with it. Else it's just
> decoration.

As I understand layer type is useful for example to tell the backend there should copper. Then it is also possible assign your own layer type value: "mechanical", "documentation" or whatever name you want but gEDA will not care about this. In case you want to do something useful with these layer you have to add meaning yourself.

The same apply for the attributes and I have tried this myself.

Nicklas Karlsson