A position question

I have a list of elements, some with matching ids. How do I find the
position of the elements with matching ids within the context node?

<elemA>
	<elemB id="11"/>
	<elemB id="12"/>
	<elemB id="11"/>
	<elemB id="44"/>
	<elemB id="33"/>
	<elemB id="11"/>
</elemA>

I would like to find the positions of the elemB elements with id="11". I can
get the next one by following-sibling::elemB[@id="11"], but I don't know how
to find it's position in the context node. Any suggestions?

Thanks,
Suraiya

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