Quote:
Originally Posted by kovidgoyal
The philosophical issue of whether trying to assign a unique id to electronic documents is meaningful. On this I strongly believe it is not. A consequence of that is that I believe a statement like "producing books with non unique ids is catastrophic" is just wrong.
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You're the only one having a philosophical argument here: I'm pointing out that the standard requires such a unique identifier and that reading systems will use it too.
It can be catastrophic if one day we wish to handle such things such as shared annotations as we won't be able to rely on the identifier to identify a book (which is the whole purpose of an identifier).