Element Namespace Prefixes in the XmlTextWriter
You can pass, as a parameter to the WriteStartElement, the namespace prefix to prepend to the element. The method then prepends the namespace prefix to the element when it writes it out. The following code example shows the use of the namespace prefix in the WriteStartElement method call.
Dim w As New XmlTextWriter(Console.Out)
w.WriteStartElement("x", "root", "urn:1")
w.WriteStartElement("y", "item", "urn:1")
w.WriteEndElement()
w.WriteEndElement()
w.Close()
XmlTextWriter w = new XmlTextWriter(Console.Out);
w.WriteStartElement("x","root","urn:1");
w.WriteStartElement("y","item","urn:1");
w.WriteEndElement();
w.WriteEndElement();
w.Close();
Output
<x:root xmlns:x="urn:1"><y:item xmlns:y="urn:1"/></x:root>
Both prefixes x and y have been preserved.
Note
Specifying a prefix and an empty namespace Uniform Resource Identifier (URI) is an error that violates Section 2 of the World Wide Web Consortium (W3C) Namespace in XML specification (www.w3.org/TR/1999/REC-xml-names-19990114/#ns-decl). If an empty namespace URI is given, an exception is thrown.