Enum EpubChapterSplit
Where one content document ends and the next begins.
public enum EpubChapterSplitFields
WholeDocument = 0One content document for the whole book.
Simple and correct, and the wrong default for anything long: a reading system loads a content document whole, so a three-hundred-page book in one file is a three-hundred-page parse before the first page appears.
Heading = 1A new content document at every heading of HeadingLevel or above. The default.
Section = 2A new content document at every Word section break.
Remarks
Every option here is a question the document model can answer. Splitting by page is deliberately absent: a flow format has no pages, the page a heading falls on depends on the reading device, and asking the layout engine would mean reaching across the one-way bridge for a number that would be wrong on the first device that used a different font size.