I have some confusion over these files types & over how Sigil inserets splits...
It may be used an issue with one bad book - which is a short story compilation that I think has been converted from word but anyway...
inspecting several epubs I have these questions:
1. I see that some have html fiels per chapter, some have xhtml files - I see no obvious rules as to which is uses - is that publisher discretion or a side effect of wahtever package was used to create the book. are both equally valid.
2, if I take a book which is all xhtml and arbitrarily add a split - the new file is also xhtml. if the book was all html, then so is the new file. All very logical
3. But in my problem case I see to have a mix of both types & I don't know if that is ancient editing by me, with an old version of sigil, or not ?
so can someone please tell me has sigil always worked the same way when splitting, and are there any real life consequences ( say in different readers) of changing or mixing the html *& xhtml files types within the epub zip, please
PS this relates to a query I just put on Kobo forum that I am trying to puzzle out - not sure yet if it is a sigil issue a kobo issue, or a waste of time
