"Simple" copy all and find and replace

For my program I need XML-Files, where nodes like PHOTO, IMG, FOTO, BILD, 
BILDCHEN should be renamed with the name IMAGE and the original name should be 
saved as an attribute "oldname".
The rest of the file should be the same. Just copy all and when the special 
nodes were found, rename them. I thought it would be really simple, but I tried 
some hours and had no good result. Maybe sombeody could help me.

Example for the original file:

<?xml version="1.0" encoding="UTF-8"?>

<Class>
   <Images>
       <IMG name="test1" url="/vol/bilder/test1.jpg"/>
       <FOTO name="test2" url="/vol/bilder/tes2t.jpg"/>
       <BILD name="tes3t" url="/vol/bilder/test3.jpg"/>
       <BILDCHEN name="test4" url="/vol/bilder/test4.jpg"/>
       <PHOTO name="test5" url="/vol/bilder/test5.jpg"/>
       <IMAGE name="test6" url="/vol/bilder/test6.jpg"/>
    </Images>
</Class>


should be converted to

<?xml version="1.0" encoding="UTF-8"?>

<Class>
   <Images>
       <IMAGE name="test1" url="/vol/bilder/test1.jpg"/>
       <IMAGE name="test2" url="/vol/bilder/tes2t.jpg"/>
       <IMAGE name="tes3t" url="/vol/bilder/test3.jpg"/>
       <IMAGE name="test4" url="/vol/bilder/test4.jpg"/>
       <IMAGE name="test5" url="/vol/bilder/test5.jpg"/>
       <IMAGE name="test6" url="/vol/bilder/test6.jpg"/>
    </Images>
</Class>



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