[resend!!! too many typing errors for even me to accept last time]
Michael Kay wrote:
> you can get the Nth item in a sequence using SEQ[N].
> In the rare cases where that's inconvenient because
> it changes the evaluation context, you can use
> subsequence(SEQ, N, 1).
When can this happen? Can you show an example?
Regards,
--drkm
Michael meant that to be a meta-expression with SEQ and N standing for
Xpath expressions, but if you take them as real examples with SEQ and N
being Xpath expressions selecting elements SEQ and N respectively then
you have an example where SEQ[N] and subsequence(SEQ, N, 1) are not
equivalent, as in the first N selects children of the SEQ node (and
may have a different value for each SEQ element) and in the second N selects
an N element child from the current node (which will then be a sibling
not a child of SEQ) and this value will be cast to an integer.
so
<x>
<N>2</N>
<SEQ>1<N>6</N></SEQ>
<SEQ>2</SEQ>
<SEQ>3<N>3</N></SEQ>
</x>
SEQ[N]
selects the first and third SEQ
(as they have N children)
SEQ[number(N)]
selects the third SEQ
(as that is the only one with an N child equal to its position())
subsequence(SEQ,N,1)
selects the 2nd SEQ child
(as N selects an element whose value can be cast to the integer 2.)
David
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