I did some research on this over the last couple days and it's definitely going to be challenging to write out annotations. When it comes to modifying existing annotations in PDFs, I probably will only be able to support moving or deleting them. Some of the annotation options I support may also be an issue. I'm currently struggling to find a good way to handle stamps - these may be the biggest hurdle. As far as text goes, I'm hoping I can support the majority of the options I currently offer, but some things like having a border or a fill color will result in multiple annotations being written out (a rectangle, highlight and then text). Freeform drawings and highlights will be the easiest to support, and there should be no issues with these.
Mike
Mike