[XeTeX] PDF Media, Trim, and Bleed boxes in XeTeX

[Chris Yocum]

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Hi Guys,

I have a feeling that this is a rather naive/dumb question but I will
raise it nonetheles.  I have been looking into creating pre-press
quality (PDF X-1a at least) PDFs via XeLaTeX.  It seems that most things
are there: embedded fonts (pdffonts tells me that they are), hyperxmp
for metadata, etc.  The only thing missing seems to be the TrimBox and
Bleed Boxes.  Is there a way to get these into XeTeX?  I can do it using
\special but it seems like something the geometry package should do when
knows it will produce PDFs (and should work with the crop package).  I
had a look at the pdfx package, which doesn't work with XeLaTeX, and it
seems to set the Boxes statically in the code.  It would seem to me that
they should be calculated at the time of document creation or am I
completely missing the point?

Anyway, if anyone has any guidance or advice, I would be most grateful.

All the best,
Chris
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