ShowXMLMarkup Property
Returns a Long that represents whether XML tags are viewed in a document. True indicates that tags are visible. False indicates that tags are hidden. wdToggle allows you to switch between showing and hiding the XML markup.
expression.ShowXMLMarkup
expression Required. An expression that returns a View object.
Example
The following example switches between showing and hiding the XML markup in the active document.
ActiveDocument.ActiveWindow.View.ShowXMLMarkup = wdToggle