[Bug 29153] [XSLT30] have we created a loop-hole with windowed streaming and copy-of or snapshot?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=29153

--- Comment #6 from Michael Kay <mike@saxonica.com> ---
I don't see a problem with lookahead and accumulators.

Process A does the lookahead, that is:
repeat {
  read node N
  write node N-1
}

Process B reads the output of Process A

Process A knows whether the node it has just passed to Process B is the last in
the sequence

Process B evaluates the accumulators.

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