By default, calibre does not detect the Prologue or Epilogue of a book while building a table of contents for the book during conversion.
To get calibre to detect the prologue and/or epilogue of a book, go to Preferences
-> Conversion (Common Options)
-> Structure Detection
. In the Detect chapters at (XPath expression:
box, change the text from
//*[((name()='h1' or name()='h2') and re:test(., 'chapter|book|section|part\s+', 'i')) or @class = 'chapter']
//*[((name()='h1' or name()='h2') and re:test(., 'prologue|epilogue|chapter|book|section|part\s+', 'i')) or @class = 'chapter']
Eg: add "prologue|epilogue|" (sans quotes" before the "chapter|book|section|part" part of the expression.
calibre should now detect any instances of prologue or epilogue in a book during conversion, and add entries to them in the calibre built table of contents (if an existing TOC isn't already being used of course).
@Kovid: Is there a reason why calibre does not detect the prologue and/or epilogue of a book during structure detection? If there isn't a reason (or you just didn't think of it), is it possible to change this in future builds of calibre?