[Printing-architecture] Are there really XPS-only printers?

[Till Kamppeter]

Hi,

I would like to know whether there are really printers which understand 
only XPS (plus some secret proprietary protocols) and no PDF, 
PostScript, PWG Raster, ...?

In this case I would need to add XPS printing support to Linux so that 
this class of printers gets supported. There is already a free software 
implementation in Ghostscript which would need to get supported by 
cups-filters and for phones one could also make a rastertoxps filter to 
get more lightweight support.

If there are such printers can someone give a list of models here so 
that I could perhaps get hold on one? Thanks in advance.

    Till