[xep-support] Multi tray printing

[Nikolai Grigoriev]

Frederic,

> I know there is the page-device extension, but it seems 
> to apply to the complete document. 

Exactly. There is no method to control tray selection for 
individual pages from the XSL FO source. Rx:page-device 
is already an extension; pushing it further does not fit 
into our plans.

> Since the evaluation version of Xep doesn't generate ps file, 
> could you answer me if Xep is able to generate a ps file 
> which will be printed using multi trays.

You have to postprocess XEP output. We generate ADSC-compliant
PostScript code, so it is easy to find page boundaries: just
look for "%%Page:" DSC comment. The first operator of a page
is always  /setpagedevice (repeated on every page to ensure
page independence). Tray-switching entries can be added
to the respective dictionary. I believe that a similar trick is 
possible with other PostScript generators (e.g. GhostScript):
it should be safe to add /setpagedevice immediately after DSC 
comments that open a page. 

Best regards,
Nikolai Grigoriev
RenderX

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