Base64

SUB Base64 ( Data AS String )

Writes a base-64 encoded string.

Dim Xml As XmlWriter
...
Xml.StartElement ("base64string")
Xml.Base64 ("This is Gambas!")
Xml.EndElement()
...

XML File: 

<base64string>VGhpcyBpcyBHYW1iYXMh</base64string>