Multiple xml trasformation

Hi, I have question: 
I have many XML documents of the same format like this 
<Entries> 
    <Entry>...</Entry> 
     <Entry>...</Entry> 
    ... 
</Entries>. 

I'm using muenchian method to select distinct entries from file and
display 
its count. 

And question is: 
How can I count distinct entries from multiple xml files ? 
Is some way how to merge these xml files to one source and then perform 
tranformation or something else how solve this problem? 

thanx Jozef 

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