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-<section 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-relnotes-0.9">
-
-<title>Release 0.9 (2005-09-16)</title>
-
-<para>NOTE: this version of Nix uses Berkeley DB 4.3 instead of 4.2.
-The database is upgraded automatically, but you should be careful not
-to use old versions of Nix that still use Berkeley DB 4.2.  In
-particular, if you use a Nix installed through Nix, you should run
-
-<screen>
-$ nix-store --clear-substitutes</screen>
-
-first.</para>
-
-
-<itemizedlist>
-
-  <listitem><para>Unpacking of patch sequences is much faster now
-  since we no longer do redundant unpacking and repacking of
-  intermediate paths.</para></listitem>
-
-  <listitem><para>Nix now uses Berkeley DB 4.3.</para></listitem>
-
-  <listitem><para>The <function>derivation</function> primitive is
-  lazier.  Attributes of dependent derivations can mutually refer to
-  each other (as long as there are no data dependencies on the
-  <varname>outPath</varname> and <varname>drvPath</varname> attributes
-  computed by <function>derivation</function>).</para>
-
-  <para>For example, the expression <literal>derivation
-  attrs</literal> now evaluates to (essentially)
-
-  <programlisting>
-attrs // {
-  type = "derivation";
-  outPath = derivation! attrs;
-  drvPath = derivation! attrs;
-}</programlisting>
-
-  where <function>derivation!</function> is a primop that does the
-  actual derivation instantiation (i.e., it does what
-  <function>derivation</function> used to do).  The advantage is that
-  it allows commands such as <command>nix-env -qa</command> and
-  <command>nix-env -i</command> to be much faster since they no longer
-  need to instantiate all derivations, just the
-  <varname>name</varname> attribute.</para>
-
-  <para>Also, it allows derivations to cyclically reference each
-  other, for example,
-
-  <programlisting>
-webServer = derivation {
-  ...
-  hostName = "svn.cs.uu.nl";
-  services = [svnService];
-};
-&#x20;
-svnService = derivation {
-  ...
-  hostName = webServer.hostName;
-};</programlisting>
-
-  Previously, this would yield a black hole (infinite recursion).</para>
-
-  </listitem>
-
-  <listitem><para><command>nix-build</command> now defaults to using
-  <filename>./default.nix</filename> if no Nix expression is
-  specified.</para></listitem>
-
-  <listitem><para><command>nix-instantiate</command>, when applied to
-  a Nix expression that evaluates to a function, will call the
-  function automatically if all its arguments have
-  defaults.</para></listitem>
-
-  <listitem><para>Nix now uses libtool to build dynamic libraries.
-  This reduces the size of executables.</para></listitem>
-
-  <listitem><para>A new list concatenation operator
-  <literal>++</literal>.  For example, <literal>[1 2 3] ++ [4 5
-  6]</literal> evaluates to <literal>[1 2 3 4 5
-  6]</literal>.</para></listitem>
-
-  <listitem><para>Some currently undocumented primops to support
-  low-level build management using Nix (i.e., using Nix as a Make
-  replacement).  See the commit messages for <literal>r3578</literal>
-  and <literal>r3580</literal>.</para></listitem>
-
-  <listitem><para>Various bug fixes and performance
-  improvements.</para></listitem>
-
-</itemizedlist>
-
-</section>