Hi,
I'm taking the sample xhtml code from the calibre manual at
http://calibre-ebook.com/user_manual...le-of-contents
and save it as a html file, add the file to calibre as an ebook (which results in a zip file), enable "Force use of auto-generated Table of Contents", set level1 and level2 toc values as described and convert to epub.
The resulting epub contains a two-level TOC as expected, but if I convert this epub again to epub using the same setting, the TOC of the new epub contains only the level1 headings. Bummer.
Ciao,
Steffen