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An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.


Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

eXtensible Markup Language (XML)

eXtensible Markup Language (XML) is a markup language defining a set of rules for encoding documents in both a human-readable and machine-readable format.

Last Updated: Feb 22, 2024