Re: gEDA-user: Re: Composite/negative layers in gerbers

[Paul Kube <kube@xxxxxxxxxxxxxx>]

I made all layer names unique and resubmitted the job to OLIMEX.

Their reply: 

"every decent cad product can generate copper pour with hatch stroke fill
the negative plot is ancient way to make copper ground back in the ages 
when computers had no power to calculate the stroke fill coordinates
we can't handle your order if made with composite layers"

So, apparently they mean the same thing by 'composite layers' and 
'negative plots', namely the use of LPD and LPC on the same layer.

--Paul