[Inkscape-devel] PDF, CMYK and cairo

Hello all, I was looking at the cairo-pdf export code and wondered how hard it would be to output PDFs in CMYK(a) colorspace ? From what I've seen it shoudl be fairly easy on inkscape side. However the status of CMYK(a) support in Cairo looks unclear to me (found some references in cairo ML but nothing in the actual cairo headers, + a ruby (?) implementation for it). Does anyone have a some knowledge / pointers on that ?