[xsl] XSL: How reaching the elements of a list?

["chris poppe" <chris_poppe@xxxxxxxxxxx>]

Hello,

Im facing the following problem, I have an xml element like this

<MV>
  <MV_nr> 15 </MV_nr>
  <MV_interior>1864  144 </MV_interior>

</MV>

and want it to be

<MV>
  <MV_nr> 15 </MV_nr>
  <MV_interior>1864  72 </MV_interior>

</MV>

the MV_interior element is a list with length 2 and type nonNegativeInteger. 
The first element represents a position, the second a length. So I want to 
go in the list take the second element, divide it by 2 and put it back but I 
dont know how I can reach that second element in my list?

The xml document is fixed so I cant change the element into two elements or 
something,

hope someone can help me,
greetings Chris

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