count all the distinct timezones in an XML document using XPath

[David Carlisle]

count(distinct-values(//(element(*,
xs:date)|attribute(*, xs:date)|element(*, xs:datetime)|attribute(*,
xs:datetime))/date-from-timezone(.))) eq 1

> If there was a map function in XPath

in simple cases (as here) you can use / as map otherwise  a for clause
serves that purpose.

your map(f,seq) is

for $s in seq return f($s)

David

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