difference between Result Tree Fragment (RTF) and a no

Hi all,
What is the difference between Result Tree Fragment
(RTF) and a nodeset?

My perception is RTF is a set of nodes in user defined
tags like -

<mytag>
<value/>
<value/>
</mytag>

and nodeset is the set of nodes got from the input doc
itself.

Is this correct?

Thanks in advance


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