XmlDocument xsi:type not showing xsi namespace

[Mazen IIXIS]

Hello all. I'm running into a problem that I can't seem to be able to resolve. The "xsi" kept disappearing from the node that is supposed to show "xsi:type".

XmlDocument xml = new XmlDocument();

XmlDeclaration XmlDeclaration = xml.CreateXmlDeclaration("1.0", null, null);

XmlElement element = xml.CreateElement("Definitions");
XmlNode objectName = xml.CreateElement("AnObject");

element.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
element.SetAttribute("xmlns:xsd", "XML Schema");

xml.AppendChild(XmlDeclaration);
xml.AppendChild(element);
element.Appendchild(AnObject);

XmlElement anObjectElement = xml.CreateElement("ObjectChild");

anObjectElement.SetAttribute("xsi:type","AnObject_Definition");

xml.DocumentElement.ChildNode[0].AppendChild(anObjectElement);

xml.Save("SomeFileNameHere");

I've looked at other forums but they don't seem to provide the right answers that I need to resolve the problem. The attribute have to show <ObjectChild xsi:type="AnObject_Definition">, I kept getting <ObjectChild type="AnObject_Definition">. I need the xsi to be included inside the xml file.

Help will be greatly appreciated!

EDIT: That xsi is absolutely critical to what I am doing. I must have the xsi included at the start. It must be xsi:type or it will throw an critical error in a program that I am working with.

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