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1 XML can keep data separated from your HTML. 2  XML can be used to store data inside HTML documents. 3  XML can be used as a format to exchange information. 4  XML can be used to store data in files or in databases.
Lots of different types of programs use XML as a way to store their data in a standard way, but actually using an XML file for a specific purpose requires that you know what that particular XML file is storing data for. For example, the XML format is used for MusicXML files, an XML-based sheet music format.