From my experience in making PDF documents for design work - the software/implementation is different. Basically when you comment on a PDF - the Adobe Acrobat software updates the PDF itself.
With the 700 the annotation is a referential one stored in a separate XML file. Which is nice in the sense that you can annotate multiple file types. However, is kinda limiting for the particular document editing you are wanting to do.
Cheers,
J
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