Generating multi-level flexible recursive nested lists

Hello,

I was wondering if somebody can help me to generate
Multilevel OL and LI. Here is the input and output
expected. If we add some more levels like level4 or
level5, xslt should be able generate output without
any change in it.

I have been trying this since many days.

I would highly appreciate your help. Thanks in
advance.

INPUT
----

<doc>
<p style="level1">
ALevel1
</p>
<p style="level1">
BLevel1
</p>
<p style="level2">
aLevel2
</p>
<p style="level2">
bLevel2
</p>
<p style="level1">
CLevel1
</p>
<p style="level1">
DLevel1
</p>
<p style="level2">
aLevel2
</p>
<p style="level2">
bLevel2
</p>
<p style="level3">
iLevel3
</p>
<p style="level3">
iiLevel3
</p>
<p style="level2">
cLevel2
</p>
<p style="level1">
ELevel1
</p>
</doc>


OUTPUT EXPECTED
---------------
<doc>
<ol>
<li>
ALevel1
</li>
<li>
BLevel1
</li>
<ol>
<li>
aLevel2
</li>
<li>
bLevel2
</li>
</ol>
<li>
CLevel1
</li>
<li>
DLevel1
</li>
<ol>
<li>
aLevel2
</li>
<li>
bLevel2
</li>
<ol>
<li>
iLevel3
</li>
<li>
iiLevel3
</li>
</ol>
<li>
cLevel2
</li>
</ol>
<li>
ELevel1
</li>
</ol>
</doc>

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