[sugar] pygtk's ".defs" files, and wrapping interfaces for python extensions

[Don Hopkins]

Can somebody please tell me where I can find some documentation on the 
.defs files used by pygtk, pangocairo, etc?
It look like that is an alternative to SWIG for integrating C code with 
Python. Is it preferred? Does it work with other languages?
Will it save memory or work better to use that ".defs" file based 
interface generator instead of SWIG?

I'm trying to figure out how best to integrate poppler into Python, and 
pass a Cairo context into it (which was wrapped by pycairo), so it can 
go to town drawing PDF through Cairo.
And it seems that one way to do that might be to add it into pygtk's 
cairo/pango interface, or into pycairo, but I don't know the politics 
involved in that, or if it's easier to make a separate project for poppler.
Any suggestions please? Thanks a lot!

    -Don