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mlDoc=loadXMLDoc("books.xml");
var x=xmlDoc.getElementsByTagName('book');
var newel,newtext;
for (i=0;i<x.length;i++)
{
newel=xmlDoc.createElementNS('p','edition')
;
newtext=xmlDoc.createTextNode('First');
newel.appendChild(newtext);
x[i].appendChild(newel);
}