I want to read a epub and I know it is zipped.
and I want to ask that where is the format of the epub ?
for example
if should start at .opf and in there is a xml of package
but what is inside package? I want to find the version 2.0 and 3.0 format
EPUB format can be found on (at this posting time)
EPUB Open Container Format (OCF) 3.2
Final Community Group Specification 08 May 2019
https://www.w3.org/publishing/epub32/epub-ocf.html
and for an older specification,
Open Packaging Format (OPF) 2.0.1 v1.0.1
Recommended Specification September 4, 2010