Formatting issues

Hello:

I have issues with formatting. 

In my XML file, I have an element called <level> and
there can be 6 levels. 

<level1>...<level6>

I am applying a filtering logic for all levels.

So suppose I have an XML like this:

<level1>
.........
</level1>

<level1>
.....
</level1>


<level1>
...
</level1>

The output will be 
1.
2.
3.

Now based on the filtering logic, if level1 and 2 are
eliminated, then level 3 should start with number 1.
and not with number 3. 

Is there a way to deal with this? Thanks in advance
for your help. 


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