bulia byak wrote:
(I know of UberConverter, but PDF is the most important interchange format so we should better support it natively)
The PrintingConsensusPoll has not seen much progress the last half year.. (you've lost a few links there, btw. It's PDF_Bugs, PDF_Test_Cases, and PDF_Tools) On the mailing list, however, there seem to have been a silent agreement on using Cairo for PDF output when/if Inkscape starts use it for rendering. Is that what you search here?
I wrote my own PDF output for Inkscape few weeks ago. It doesn't even try to address all your requirements and is not based on Cairo. All I wanted was a PDF with colours, bounding box and transparency. And that is about all there is. I never got much further than strokes and fills. It wasn't needed for the drawings I wanted to convert anyway. There is no support for features such as text, patterns or embedded images..
If this still sounds interesting enough as a starting point I could mail it to you.
/Ulf