[cups.development] Register a CUPS backend

[Michael R Sweet]

Sergio Costas wrote:
> Hello:
> 
>> Right, "pcproc_backend:/" is not a valid URI.  Try:
> 
>>      psproc_backend://unused
> 
> I tried it, but still fails...

Oh, "_" is not allowed in a scheme name, you'll need to rename your
backend...  You can use ASCII letters, numbers, "-", "+", and "." in
the name.

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Michael R Sweet                        Senior Printing System Engineer