Xournal: how to use for an existing pdf?

[LinuxIsOne]

On Tue, Dec 6, 2011 at 9:23 AM, Amedee Van Gasse <amedee-ubuntu at amedee.be>wrote:

Short answer: You cannot edit a pdf file. You can only make annotations.
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> PS: before all the hordes rush in: You cannot edit a pdf file with Xournal
> if it is your intention to change text and stuff. You can't do that at all
> with a pdf file, it is not meant for editing. Well, actually you can, but
> it is rather complex and limited. Trust me, I know. I have the iText book
> on my bookshelf.
>

Okay well but can one simply tell me how to merge files via Xournal?
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