Than it's even easier to perform my task.
Calibre is really an incredible powerful and smart tool.
Thanks to all of you who contribute to it
Can anybody tell me a good information source (webpage), where it is explained, which epub optimizations are useful in a way which is easy to understand for a newbie in epub editing?
What I'm specially looking for:
Heuristics, which eliminate all source code of the html files, which is only for layout and not for semantic.
My wish is to have epubs in plain semantic xhtml. Free of redundant and ugly tags, classes, ids, inline-styles.
In other words:
Books without any layout at all.
Just structure.
Another thing:
Do modern eReaders have problems with ePubs in a single HTML file?