how do i know total number of specific nodes between root node and current node in xslt?

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XSLT

Hi All,

I want to count the total number of specific nodes between root node and current node. for Example:

<pre lang="text"><w:body xmlns:w="#unknown"> <!-- root Node -->
     <w:p />
             <w:rect>
             <w:p>some text1</w:p>  
            </w:rect>
     <w:p />
             <w:rect>
              <w:p>some text2</w:p>  
            </w:rect>

     <w:p />
     <w:p />
     <w:p />
            <w:rect>
             <w:p>some text5</w:p>   <!-- This is current node now -->
            </w:rect>
     <w:p />
     <w:p />
     <w:p />
     <w:p />
</w:body>

This is my scenario.Here, Assume some text is my current node.So, Now i want to get the parent::w:p of the current node (Assume this node name as "targetNode"). After that i want to calculate total number of the same level of w:p from root node to targetNode.

My wanted output is :5

Please Guide me to get out of this issue...