There's another difference - xournal doesn't understand the "landscape" or "activity" (calendar) background style, so instead of just
Code:
zcat $infile | sed -e 's/\(^.*<page .*\) tabname.*$/\1>/' | gzip -c > $outfile
you need to do:
Code:
zcat $infile | sed -e 's/\(^.*<page .*\) tabname.*$/\1>/' -e 's/landscape/plain/' -e 's/activity/plain/'| gzip -c > $outfile
There may be more...