Hello,
Sorry for not replying sooner (I've been a little busy these days). Thanks a lot for your replies.
Let's take it step by step:
1. There is no way to export directly to epub from xara instead of html (unless xara builds this export filter)
2. Related to the flipping books. There are many commercial products out there but I think Xara Supersites (http://previews.xara.hosting/menu/#xl_xr_page_index) are more suitable for the digital environment. But if you really want a flipping book then you can use this project http://www.turnjs.com (all you need is to export all pages as images and edit the main html file - demo here: https://github.com/blasten/turn.js/t...demos/magazine)
3. Related to what Gray said. If Xara could implement these features then great.

My approach related to the interactive part was:
- use the widgets to enrich a document
- export to html
- convert the generated html in epub or app