[xsl] increasing variable?

["chris poppe" <chris_poppe@xxxxxxxxxxx>]

Hello,

Im facing the following problem, here's a piece of my xml doc
<GOP_CONTENT>
    <SUBSTR>
<SUBSTREAM>
<stuff>3216465</stuff>
               <SUBSTREAM_interior>134 464</SUBSTREAM_interior>
              </SUBSTREAM>
              <SUBSTREAM>
                <stuff>64664654</stuff>
<SUBSTREAM_interior>600 1862</SUBSTREAM_interior>
</SUBSTREAM>
      </SUBSTR>
     <MV>
<MV_interior>2462 977</MV_interior>
<MV_end>4294967295</MV_end>
     </MV>
    <SUBSTR>
<SUBSTREAM>
<stuff>1635456</stuff>
<SUBSTREAM_interior>3441 277</SUBSTREAM_interior>
</SUBSTREAM>
     </SUBSTR>

(its an xml doc describing a bitstream) the first element of the interiors 
(both MV_interior and SUBSTREAM_interior) are positions in the bitstream, 
the second element is the length (of the MV or SUBSTREAM). As you can see 
the first substream starts at 134, the second at 600 ( wich is 134 + the 
length + 2 (stuff) ).

What im trying to do here is to halve ( sorry for my english, I mean divide 
by 2) the length of the Substreams. Offcourse the positions should be 
altered too and here comes the problem. I thought i could declare a variable 
'position'  initiate it at 134 and every time I come across a substream or 
mv I just add the length but as Ive understood you cant just change your 
variables?

hope anyone can help me out here, every suggestion is welcome,

this is what the xmldoc should become :

<GOP_CONTENT>
    <SUBSTR>
<SUBSTREAM>
<stuff>3216465</stuff>
               <SUBSTREAM_interior>134 232</SUBSTREAM_interior>
              </SUBSTREAM>
              <SUBSTREAM>
                <stuff>64664654</stuff>
<SUBSTREAM_interior>368 931</SUBSTREAM_interior>
</SUBSTREAM>
      </SUBSTR>
     <MV>
<MV_interior>1299 977</MV_interior>
<MV_end>4294967295</MV_end>
     </MV>
    <SUBSTR>
<SUBSTREAM>
<stuff>1635456</stuff>
<SUBSTREAM_interior>1276 277</SUBSTREAM_interior>
</SUBSTREAM>
     </SUBSTR>

greetings Chris

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