While the contents of an Annotation element need not actually be rendered as pop-up text, I thought it might be useful to provide some examples of what "rich" annotative pop-up text might look like. Here's an example that shows rendering of a couple of annotations in HTML/Javascript:
http://www.logopoeia.com/docbook/dontlearn.html#les2 If you mouse over the phrase "because I just happen to have such a table handy" on that page, you will get a pop-up annotation that includes an embedded image and a hyperlink. If you mouse over the "Table 1." part of the table title, you'll see a second annotation. As far as I can tell, annotations (or "notes", as Adobe now calls them) in PDFs are limited to unformatted plain text, with no embedded images or hyperlinks. Nevertheless, I thought it might be useful to also show examples of what annotations looks like in a PDF file:
http://www.logopoeia.com/docbook/dontlearn.pdf You can view the annotations in that by double-clicking on the phrase "I just happen to have such a table" and on the annotation/note marker to the right of the table. --Mike