Use child[not(.=preceding-sibling::child)]

Mike Kay

> 	Say I have some XML that looks like this:
> 
> 	<rootelement>
> 		<child>1</child>
> 		<child>2</child>
> 		<child>2</child>
> 		<child>3</child>
> 	</rootelement>
> 
> 	And I want to do a query that returns only the elements 
> that have a unique value 


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