Like, you could publish something as a series of articles, as an online magazine, or as a document to be downloaded and read on ePaper. You wouldn't necessarily want to formatted identically, everywhere, or using the same title page or cover Image, or whatnot.
Discussion
You could also reuse format events, or reuse zettles in a different document with different formatting.
Complicated, so v0.3.0.
You can see how difficult it is, just configuring index event tags. 😂