IEC 62448:2017 is also available as IEC 62448:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 62448:2017 specifies a generic format for multimedia e-publishing employed for e-book data interchange among data preparers and publishers, satisfying a number of publishers’ requirements: revisable, extensible and heterogeneous logical structure. This fourth edition cancels and replaces the third edition, published in 2013 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) clarifying descriptions,
b) deleting redundant statements,
c) resolving mistakes and confusing terminologies.