[KevinH]

Please next time, do not post in the Sigil forum seeming to indicate a problem with Sigil exists when in fact all of your questions/issues had nothing to do with Sigil at all.

Please use the ePub forum here at Mobileread for general questions about epubs, not the Sigil forum unless there is an actual issue with Sigil.

You may actually want to read up about epubs in general, and its components and actually try before asking for help as much of the information you were asking about is available on how-to guides and here in our own Mobileread Wiki.

Expecting Doitsu to fix all of errors the validator reported is way beyond the call of duty and should never be your first or even second channel of advice or help.