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Custom XML markup is removed when you open a document in Word 2013
Explains why a particular custom XML markup implementation is removed in Word 2013.
Show the Developer tab - Word - Office.com
Show the Developer tab in the ribbon.
What's new for Office 2013 developers
Open XML Formats and file name extensions - Office Starter - Office.com
Read about the XML Formats used in Excel, PowerPoint, and Word.