What is the use of XML mapping panel in MS word 2013?

• Represents the XML mapping between custom XML and a content control on a ContentControl object. An XML mapping connects the text in a content control to an XML element in the document's custom XML data store.
• Using an XPath string, use the SetMapping method to add or alter the XML mapping for a content control. The example below sets the document author's built-in document property, inserts a new content control into the active document, and then sets the control's XML mapping to the built-in document property.

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