<part xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.0" xml:id="ch-installation"> <title>Installation</title> <partintro xml:id="ch-installation-intro"> <para> This section describes how to obtain, install, and configure NixOS for first-time use. </para> </partintro> <xi:include href="obtaining.xml" /> <xi:include href="installing.xml" /> <xi:include href="changing-config.xml" /> <xi:include href="upgrading.xml" /> </part>