What are the two ways to create or modify an unattend xml file?

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What are the two ways to create or modify an unattend xml file?

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The only way to create an unattended xml file is to use a text editor, or an application that helps you write xml code. The purpose of an unattended xml file is to automate a function (usually an installation procedure). So you would have to know or always refer to xml coding protocol.