Namespace Prefix
The XML | Namespace Prefix command is available in Grid View and opens a dialog box in which you can set the namespace prefix of the selected element or attribute, and, in the case of elements, of its descendants as well.
You can choose to set the namespace prefix on either elements, attributes, or both. The namespace prefix is applied to the selected element or attribute, and, if an element is selected, to descendant nodes of the selected element.