Looks like the last two lines of roundup/backends/indexer_xapian.py need
to be changed from:

        return [tuple(m[xapian.MSET_DOCUMENT].get_data().split(':'))
            for m in matches]

to:

        return [tuple(m[xapian.MSET_DOCUMENT].get_data().split(':'))
            for m in matches.items]

(i.e. add ".items" to the last line).

That should work with both Xapian 1.0 and 1.2, but I've not tested - I
don't have a source tree for roundup currently setup, and I've got a
post-holiday mail mountain to get through.

Incidentally, looks like this code isn't exercised by the roundup
testsuite, since that passed with Xapian 1.2 when I tried it after the
previous fix.

tonimueller - this probably needs fixing in Debian squeeze...