Trying to explain the title: I am creating an EPUB document which is a programming course. In the document I want to refer to texts describing labs: these are not in the main flow of the main document: you can click if you want to read the labs (or not) and then get back to the main document.
In the lab documents there are also links to solutions (you need to click and later come back)
this means I want to have an hypertext tree in my epub with a main text with a normal flow and additions which are not part of the normal flow. How do I do that? thanks
(note: EPUB is created using ASCIIDOC but I can write unix scripts massaging the files in the zip)