filtering by ancestor

I'm writing a breadth-first parser but I want to restrict the parse to
/resultset/result[1]
So at any given node I need the subset of following::* that has
/resultset/result[1] as an ancestor.

I was trying to do something like this:
following::*[ancestor::resultset/result-item[1]]
but that's always true since it only tests if result-item[1] exists.

I also tried another approach:
following::*[/result/result-item[1]//node() = current()]
but that just doesnt work..

Any ideas?
Thanks,
Konrad


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