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Date: Sun, 27 Sep 2015 11:41:07 +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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> Besides that the most important export formats for manufacturing
> are vector based. For example Gerber primitives are straight line 
> segments and circular arcs, which can either be stroked with (not 
> even arbitrary apertures), or filled when forming a closed contour. 
> While it is possible to be more flexible than Gerber, the primitives 
> should include what Gerber can do (this includes contours with arc 
> elements).
> 
> ...
> 
>     Gabriel

Then at least on some point the text have to be transformed to these primitives. I would also guess it is these primitives the design rule check will look and it also make sense because the physics like electricity or other manufacturing process do not care about which "logical" symbol they have been part of then drawing the circuit board.

Nicklas Karlsson