Once you begin editing ePub file (it doesn't matter ePub2 or ePub3) even so slightly or you save as to a different file Chapters will use XSLT transforms on NCX in case ePub2 to produce a Navigation Document and adds it to manifest then it adds any required by ePub3 metadata adding it too to
the package OPF and upgrades package version to 3.
Not exact matches
OPF file begins with a declaration and
package tag that looks something like this: <
package version ="2.0"unique - identifier ="PrimaryID"xmlns ="http://www.idpf.org/2007/
opf">
It creates XML entries for your EPUB
package that can be easily inserted into the
OPF file.
It is recommended that you utilize KindleGen on an EPUB
package, not an HTML or
OPF file.
The
opf: alt - rep attribute [
Packages 3.1] provides the ability to include and identify alternate script renderings of language - specific metadata.
It consists of three open standards: Open Publication Structure (OPS), Open
Packaging Format (
OPF), and Open Container Format (OCF).
OPF stands for Open
Packaging Format — so you'll sometimes see the
OPF referred to as the Package File.