navigating within an XML document

Hello,

I was wondering if anyone knows how to implement a function in bitflux 
that allows navigating between parts of an XML document with the same 
XML tag.  For example, if I have the following (partial) document:

"bla bla bla <interesting>alb</interesting> bla bla bla 
<interesting>lab</interesting> bla bla bla"

I would like to be able to navigate from the first instance of text 
tagged with <interesting> to the second instance of text tagged with 
<interesting>, or vice versa (i.e. in my example navigate from "alb" to 
"lab" and vice versa).

Thank you very much in advance for your help.
-Florian

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