Has anyone generated Open Office Calc XML files from python

[vj]

I have a program which generates xml files for excel but these files
are not recognized by open office calc. I looked at the OO uno library,
but it seems like an over kill.

In my experience, for simpler documents, it is much faster to directly
write to underlying XML format. Has anyone done this? Any idea on the
XML format used by Open Office Calc?

VJ