sequence[not(item)]
Assume that the root element, <sequences>, is the context node.
Is that the right way to express the rule?
It's Ok, arguably sequence[empty(item)] is more direct (as it relies
less on the implicit boolean value of a list of items) but it's same
thing really (I tend to use not() as empty() is a newfangled xpath2
addition)
every $element in $set//element satisfies exists(sequence[(item =
$element) and not(item[2])])
looks OK to me, an alternative might be
not($set/element[not(.=current()/sequence[not(item[2])]/item)])
which is also xslt1 1 again as it happens.
David
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