(re-)calculating attribute values

hello *.*,
  following xml-file:

<A start="20" end="28">Text1</A>
<B start="29" end="35">Text2</B>
<C start="36" end="39">Text3</C>
<C start="40" end="44">Text4</C>
<A start="45" end="51">Text5</A>
<C start="52" end="58">Text6</C>
<B start="59" end="69">Text7</B>
...

i want to write a xslt file which removes all <C> elements (no problem) and
recalculates start and end values by filling up the gaps. and here i have
the problem: in the first case it is possible to fill up the gab between the
first <B> and second <A>:

1: <A start="20" end="28">Text1</A>
2: <B start="29" end="35">Text2</B>
3: <!-- removed <C> element(s) -->
4: <A start="36" end="42">Text5</A>
5: <!-- removed <C> element(s) -->
6: <B start="52" end="62">Text7</B>   (problem!!!)

The problem arises at the second gap (line 6). the gap is calculated by
using end value of second <A> and start value of last <B> (59-51=8) and not
by using already recalculated values in previous step (59-42=17).

what's going wrong here? has anyone a hint or maybe a solution for me?

any help would be appreciated!

regards
  christian


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