Not long ago I suggested the “general overview” section of the documentation should have something like this put in it:
> "Pdf Editor allows simple manipulation of objects within the PDF
> structure, using a graphical and command-line interface and a
> powerful scripting language. Changes to a document are added to it
> as a new revision so that old revisions can be viewed or saved as a new file.
> This means that if you delete something from a document it can still
> be seen in the previous revision, and the file will not get smaller."
The other thing that isn’t clear from the documentation is how other software deals with these revisions. Can they be seen by any other program? It would be good if the documentation stated this.