Quote:
Lack of annotation support. There is presently no standard mechanism by which user-generated (aka “post publication”) information such as reading-position, bookmarks, and annotations may be stored and exchanged, which reduces interoperability across Reading Systems. It unclear if annotations should be a separate specification which could “overlay” the other EPUB specs. Note that annotations may wish to be stored and/or transported separately from publication content, and there exist at least two annotation specifications that can work with EPUB as well as other formats (DAISY and Adobe’s).
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I think this could be the most important.