>More generally, what will be the consequence of adding this element to
the Book XML vocabulary?
It's an open invitation to tag abuse: someone will discover that nothing
breaks if they use this field to hold a readability metric for the book,
and so they will use it for that, or for something else.
Of course, "tag abuse" is a loaded term. I have seen examples where tag
abuse delivered superb new functionality in a system at very low cost.
But perhaps that could have been achieved without tag abuse if the
designers had had more foresight.
Michael Kay
Saxonica
