Note that I am doing mere string comparison. I am comparing the string
'20170817' against the string '20170816'.
Will the XPath always work?
It will always work if the dates are valid dates in the Gregorian calendar
between years 0 and 9999, always represented by 4 digits, and if your default
collation isn't something pathological where digits collate out of order.
(Come to think of it, it's not totally pathological for a collation to ignore
leading zeroes in an all-numeric string, so perhaps you're only safe with dates
from 1000AD to 9999AD)
Michael Kay
Saxonica
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