epub3 epub2
metadata metadata
+ identifier + identifier
? id ? id
?m identifier-type
?m scheme ? scheme
+ title + title
? lang ? lang
?m title-type
?m display-seq
+ language + language
* contributor * contributor
?m role ? role
?m file-as ? file-as
?m display-seq
* creator * creator
?m role ? role
?m file-as ? file-as
?m display-seq
? date * date
[simpler than it used to be 1] ? event
m modified [this one is special 2]
? source * source
? type * type
* coverage * coverage
* description * description
* format * format
* publisher * publisher
* relation * relation
* rights * rights
* subject * subject
[1] date is simpler than it used to be, I believe it means "when this book was originally written or created", and looks like this:
2012
[2] modified metadata looks like this:
2011-01-01T12:00:00Z