using System;
using System.IO;
using System.Xml;
public class Sample
{
public static void Main()
{
XmlDocument doc = new XmlDocument();
doc.LoadXml("<book xmlns:bk='urn:samples' bk:ISBN='11111111111'><title>A</title></book>");
XmlElement root = doc.DocumentElement;
XmlAttribute attr = root.SetAttributeNode("genre", "urn:samples");
attr.Value="novel";
Console.WriteLine(doc.InnerXml);
}
}
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