How can I get the position of an element that has a descendant 'y' with value 'z' ?

["mohamed" <mohamed at b-bop dot com>]

Hi

How can I get the position of an element that has a descendant 'y' with value 'z' ?

<?xml version="1.0"?>
<elementList>

    <element>

        <x>

            <y>a</y>

        </x>

    </element>

    <element>

        <x>

            <y>z</y>

        </x>

    </element>

</elementList>

 

I would want to get the position of the element that has a descendant 'y' whose value is 'z' and put it in a variable, in the above example the value of the variable should be 2.

 

thank you