Merge branch 'master' of github.com:thatdocslady/nix

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	doc/manual/release-notes.xml
	doc/manual/writing-nix-expressions.xml

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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-relnotes-0.7">
+
+<title>Release 0.7 (January 12, 2005)</title>
+
+<itemizedlist>
+
+  <listitem><para>Binary patching.  When upgrading components using
+  pre-built binaries (through nix-pull / nix-channel), Nix can
+  automatically download and apply binary patches to already installed
+  components instead of full downloads.  Patching is “smart”: if there
+  is a <emphasis>sequence</emphasis> of patches to an installed
+  component, Nix will use it.  Patches are currently generated
+  automatically between Nixpkgs (pre-)releases.</para></listitem>
+
+  <listitem><para>Simplifications to the substitute
+  mechanism.</para></listitem>
+
+  <listitem><para>Nix-pull now stores downloaded manifests in
+  <filename>/nix/var/nix/manifests</filename>.</para></listitem>
+
+  <listitem><para>Metadata on files in the Nix store is canonicalised
+  after builds: the last-modified timestamp is set to 0 (00:00:00
+  1/1/1970), the mode is set to 0444 or 0555 (readable and possibly
+  executable by all; setuid/setgid bits are dropped), and the group is
+  set to the default.  This ensures that the result of a build and an
+  installation through a substitute is the same; and that timestamp
+  dependencies are revealed.</para></listitem>
+
+</itemizedlist>
+
+</chapter>
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