[Bug 26958] On not precluding updates in XQuery 3.0

https://www.w3.org/Bugs/Public/show_bug.cgi?id=26958

--- Comment #9 from Michael Kay <mike@saxonica.com> ---
I think the key feature of the property we have been calling "identity" is that
it is associated with things that have a life-history: a creation event, often
followed by mutation, and finally destruction. For such things, identity is
established by the creation event, and two things with different history are
not identical even if their properties are otherwise the same. Integers do not
have a life-history; documents do. The corrollory is the existence of
constructors which are not pure functions because each invocation returns a
distinct thing.

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Received on Tuesday, 7 October 2014 20:02:36 UTC