I do not think processing relative to "the current node" context is
an issue,
Keys, as Michael pointed out, are global objects that reflect the
state of processing at any instant that a key reference is used, it is
only the nature of those references that I am concerned with.
These two statements are contradictory. The only part of the context at
the point that key() is used that affects the result is the current
node, by virtue of the fact that the last argument defaults to / which
depends on teh current node.
David
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