Quote:
Originally Posted by tompe
So what will happen when a new reader that is more restrictive in what is accepted is released?
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Let me be brutally honest: Who cares? The fact is that strive as it may, EPUB as it is now is
not an universal format and books in it
must be modified for different implementations (e.g. Adobe DE as implemented on PRS-505 will not display international characters unless the EPUB is specifically modified, it will crash the Reader on certain CSS constructs [sadly, I can't remember what it was, but it "worked" quite dependably], etc.; other implementations have their own specific quirks that need to be addressed). Does it really matter if there is one more thing to fix?
Also, get back from the academic paradise to the real world. As Kovid said, most sources are not valid XHTML. The conversion process then must decide whether it will be strict or whether it will be usable (consider what would happen to a web browser which refused to render invalid pages!).