sci_philosophy IlseBrandt-Nakamura The Same Book Three Ways en novus 2026 novus-p7-convert-twin 1.0 <p>The Same Book Three Ways</p>
<p>One. A Single Source</p>

These three files carry identical words. One is an EPUB 2.0.1 navigated by an NCX and a guide, one is an EPUB 3 navigated by a navigation document, and one is a FictionBook - a single XML file with the whole book inside it.

A converter that is working produces the other two from any one of them without losing a chapter, a heading, or an accented character.

<p>Two. Where Conversions Leak</p>

Conversions leak at the edges: the guide references EPUB 3 has no place for, the FB2 description block that has no EPUB equivalent, the cover that is a manifest property in one format, a meta element in another, and a base64 blob in the third.

Everything in this trio was chosen to sit on one of those edges.