Te optional comes cause you could have a sample like this:
Code:

<?xml version="1.0" encoding="UTF-8" ?> 
<Albums>
   <Album ref="CD142" category="Folk">
      <title>Boil The Breakfast Early</title>
      <artist>The Chieftains</artist>
   </Album>
   <Album ref="CD720" category="Pop">
      <title>Come On Over</title>
      <artist>Shania Twain</artist>
   </Album>
   <Album ref="CD024" category="Country">
      <title>Red Dirt Girl</title>
      <artist>Emmylou Harris</artist>
   </Album>
</Albums>


Code:
  
$=RemoveXMLattr($xml, "Albums/Album", "category", 0)

In wich case you have to indicate the att id to erase it. 0 should remove category="Folk" in this case.
Maybe would be better to search for the attr, get the id and then arease it if you dont now it.
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