attribute-cleanup.xml

<?xml version="1.0"?>
<xml>
 <tag b="1"  c="123"  x="abc" />
 <tag c="1"  d="123"  x="abc" />
 <tag>
  <innertag   a2="2"   b1="abc"    a1="2">Hello</innertag>
 </tag>
</xml>