Counting preceding nodes

Hi

I have the following XML structure, <level3/> is my context node. I want
to count the preceding <level3/> nodes that have the same <level1>
grandparent. I can't seem to get my head around the XPATH syntax.

<wrapper>
<level1>
        <level2>
                <level3/>
        </level2>
        <level2>
                <level3/>
        </level2>
        <level2>
                <level3/>
        </level2>
</level1>
<level1>
        <level2>
                <level3/>
        </level2>
        <level2>
                <level3/>
        </level2>
        <level2>
                <level3/>       <!-- when context, preceding count will
be 2 -->
        </level2>
        <level2>
                <level3/>       <!-- when context, preceding count will
be 3 -->
        </level2>
</level1>
</wrapper>

Thanks.
 
--
Kevin


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