thank you all for your help, it was important and urgent for me,
but I knew I could count on your help,
in fact they are the "new" rules and therefore important for everyone who wants to publish epub, more and more frequently the platforms ask to respect the ACE rules otherwise they do not accept the books.
So, I summarize because maybe someone else will need it:
- the fact remains that each xhtml page must have the reference to the language, such as xml:lang="en-US" (or other language) in <html
- in the content.opf page too, xml:lang="en-US" must be inserted as Doitsu
wrote
- in the same page all the accessMode and accessibilitySummary references must be put
- certain settings for the fonts used are also needed
I can't remember anything else, it took me two days to fix these requests (not all the online pages of epub checker have already inserted ACE),
thanks again to everyone
Bozzka