[cybmole]

I have a book , now in epub which probably came originally from pdf as the text flow is poor in some places.

I'd like to force calibre to try & improve matters, But I read somewhere that structure detection is not applied when the source is epub.

so do I need do 2 more passes i.e. go epub to ? and then ? back to epub and what format should the intermediate ? be please

or is my whole concept simply wrong/not workable ?

i decided to experiment with "the god delusion" which has been converted pdf to epub via a program called pdftoepub
( from web site pdftoepub.com )

now calibre will happliy convert that epub into mobi but when asked to converted it into rtf it fails part way through & the error details say something about mismatched brackets.

so is there such a thing as a non standard epub and is that pdftoepub program guilty of producing such a thing ?