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<section xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="sec-meta-attributes">
<title>Meta Attributes</title>
<para>
Like Nix packages, NixOS modules can declare meta-attributes to
provide extra information. Module meta attributes are defined in the
<literal>meta.nix</literal> special module.
</para>
<para>
<literal>meta</literal> is a top level attribute like
<literal>options</literal> and <literal>config</literal>. Available
meta-attributes are <literal>maintainers</literal> and
<literal>doc</literal>.
</para>
<para>
Each of the meta-attributes must be defined at most once per module
file.
</para>
<programlisting language="bash">
{ config, lib, pkgs, ... }:
{
options = {
...
};
config = {
...
};
meta = {
maintainers = with lib.maintainers; [ ericsagnes ];
doc = ./default.xml;
};
}
</programlisting>
<itemizedlist>
<listitem>
<para>
<literal>maintainers</literal> contains a list of the module
maintainers.
</para>
</listitem>
<listitem>
<para>
<literal>doc</literal> points to a valid DocBook file containing
the module documentation. Its contents is automatically added to
<xref linkend="ch-configuration" />. Changes to a module
documentation have to be checked to not break building the NixOS
manual:
</para>
<programlisting>
$ nix-build nixos/release.nix -A manual.x86_64-linux
</programlisting>
</listitem>
</itemizedlist>
</section>
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