[xquery-talk] Removing douplicate elements

[EXTERNAL Kruse Peter (Praktikant; CR/AEA1-Si)]

Hi folks

I have an xml file with douplicate elements like this

<connect>
	<a start="luigi" target="mario"/>
	<b start="luigi" target="princess"/>
	<a start="princess" target="mario"/>
	<a start="joshi" target="luigi"/>
	<a start="luigi" target="mario"/>
	<b start="luigi" target="mario"/>
</connect>

I want to remove all douplicates, so my result would look like:

<connect>
	<a start="luigi" target="mario"/>
	<b start="luigi" target="princess"/>
	<a start="princess" target="mario"/>
	<a start="joshi" target="luigi"/>
	<b start="luigi" target="mario"/>
</connect>


I managed to develope the following:
-------------------
declare function local:notIn($pivot as node(),$list as node()*) as
xs:boolean {
	if (count($list)=0) then 
		true() 
	else
		(not(	deep-equal($pivot,$list[1]))
		and local:notIn($pivot, $list[position()>1]) )
};

for $c at $cpos in $connections
	where local:notIn($c,$connections[position()<$c])
	return $c
-------------------

With small files, this works, but with larger files, i get 

Error on line 20 of file:/.../connections.xq:
  Too many nested function calls. May be due to infinite recursion.
Query processing failed: Run-time errors were reported



Any hints ?

Thanks a lot
	Peter