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This prompts a few other questions I've had for some time:

When a sequence is passed as a parameter, what is actually passed --
its copy or a reference to the sequence?

If there's actually such thing as a reference to a sequence, then why
should calculating the hash key of this reference take longer than
scanning through many items until the last (which may be thousands of
items away)?

Are subsequences shared so that when an item is added at either end
the original sequence is not copied, but a reference to itself is

I know the general answer about this being implementation-dependent,
however Saxon is the only real XSLT 2.0 processor I have at this
moment. I also believe that understanding the principles behind the
answers will help XSLT programmers write better, more efficient XSLT
code units.


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