[xml] XPath Question

Hi All,
I am trying to libxml2 and the associated xpath to find nodes in the following way:
where 'i' is 1 - last()
On the first time through (i == 1) this xpath returns al nodeset with all //toplevel/secondlevel nodes. The second time (i == 2) it returns an empty nodeset.
I need to get each secondlevel node, one at a time, is this xpath correct, or is there some other way to do this?

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