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-<chapter 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-expression-language">
-
-<title>Nix Expression Language</title>
-
-<para>The Nix expression language is a pure, lazy, functional
-language.  Purity means that operations in the language don't have
-side-effects (for instance, there is no variable assignment).
-Laziness means that arguments to functions are evaluated only when
-they are needed.  Functional means that functions are
-<quote>normal</quote> values that can be passed around and manipulated
-in interesting ways.  The language is not a full-featured, general
-purpose language.  Its main job is to describe packages,
-compositions of packages, and the variability within
-packages.</para>
-
-<para>This section presents the various features of the
-language.</para>
-
-<xi:include href="language-values.xml" />
-<xi:include href="language-constructs.xml" />
-<xi:include href="language-operators.xml" />
-<xi:include href="derivations.xml" />
-<xi:include href="builtins.xml" />
-
-
-</chapter>