copy without duplicates

Dear all.

I have the following problem. I have a XML-file which needs 
to be copied as it is, except, that each element must occur 
only once! Normally I would use the grouping-mechanism to do 
this. But I have a special problem, please take a look at my 
input:
input.xml:

<elements>
        <a/>
        <b/>
        <link location="extern1.xml"/>
        <c/>
        <a/>
        <link location="extern2.xml"/>
        <b/>
        <e/>
</elements>

extern1.xml:

<elements>
        <a/>
        <f/>
</elements>

extern2.xml:

<elements>
        <g/>
        <f/>
</elements>

So the input document references two more documents, which 
should be processed and copied to the result, too.  The 
result should be:
<elements>
        <a/>
        <b/>
        <f/>
        <c/>
        <g/>
        <e/>
</element>

Is it possible to do this with XSLT 1.0 in one stylesheet? I 
have already a two-stylesheet-solution, but one stylesheet 
would be nicer.
Thanks for your help in advanced.

Greetings,

Henning.

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