CMYK project writeup
Not sure where this should belong, but we seem to need a place to gather the conclusions about how to go about this, so it's not scattered and forgotten by the time we need it.
From Inkscapril discussion #39 (closed):
it starts here: #39 (comment 60986972)
possible summary: #39 (comment 61058639)
Jon A. Cruz:
http://codewideopen.blogspot.hr/2009/12/inkscape-should-not-support-cmyk.html