number continuation problem

Hi all,

This has had me stumped for the last few hours, so Im hoping someone can shed 
some light on it.

Given this xml structure, of <node>'s within ifs and elses:

<if>
  <node>A</node>
  <node>B</node>
  <node>C</node>
</if>
<else>
  <node>D</node>
  <node>E</node>
  <node>F</node>
  <node>G</node>
  <node>H</node>
</else>
<if>
  <node>I</node>
</if>
<else>
  <node>J</node>
</else>

All <node>'s must be numbered from 1 to x.
<else>/<node>'s should be numbered starting with the number of first <node> in 
the preceding <if>.
The first node after an if/else should start based on the last number of either 
the if or the else (whichever's greatest).

So the desired output for the above xml is:

1. A
2. B
3. C

1. D
2. E
3. F
4. G
5. H

6. I
6. J

if/else's are allowed to contain other if/else's.

quite tricky, I think.

Cheers
andrew

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