As defined in the spec, data() function retrieves the typed value of
the argument passed. The typed value (of say, a node) to me is more
useful within the processor and not very much to the end user ..
it can make a lot of difference, if for example you have some elements
containing dates and you want to compare the dates (as dates) with some
other dates, if you extract the string value then it won't work and
you'll have to explictly cast the string back to a date, but if you
extract the data() it will be a date. Of course in many situations you
select the element node rather than the text node or string value or
data() so that often this typing will be inferred, but data() is still
useful sometimes. Just as text() is still useful sometimes.
David
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