delete-old-release-notes-HEAD.patch

diff --git a/doc/src/sgml/filelist.sgml b/doc/src/sgml/filelist.sgml
index 5dfdf54..a03ea14 100644
--- a/doc/src/sgml/filelist.sgml
+++ b/doc/src/sgml/filelist.sgml
@@ -166,22 +166,6 @@
 
 <!ENTITY release    SYSTEM "release.sgml">
 <!ENTITY release-12     SYSTEM "release-12.sgml">
-<!ENTITY release-11     SYSTEM "release-11.sgml">
-<!ENTITY release-10     SYSTEM "release-10.sgml">
-<!ENTITY release-9.6    SYSTEM "release-9.6.sgml">
-<!ENTITY release-9.5    SYSTEM "release-9.5.sgml">
-<!ENTITY release-9.4    SYSTEM "release-9.4.sgml">
-<!ENTITY release-9.3    SYSTEM "release-9.3.sgml">
-<!ENTITY release-9.2    SYSTEM "release-9.2.sgml">
-<!ENTITY release-9.1    SYSTEM "release-9.1.sgml">
-<!ENTITY release-9.0    SYSTEM "release-9.0.sgml">
-<!ENTITY release-8.4    SYSTEM "release-8.4.sgml">
-<!ENTITY release-8.3    SYSTEM "release-8.3.sgml">
-<!ENTITY release-8.2    SYSTEM "release-8.2.sgml">
-<!ENTITY release-8.1    SYSTEM "release-8.1.sgml">
-<!ENTITY release-8.0    SYSTEM "release-8.0.sgml">
-<!ENTITY release-7.4    SYSTEM "release-7.4.sgml">
-<!ENTITY release-old    SYSTEM "release-old.sgml">
 
 <!ENTITY limits     SYSTEM "limits.sgml">
 <!ENTITY acronyms   SYSTEM "acronyms.sgml">
diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml
index 4055adf..cd12e1b 100644
--- a/doc/src/sgml/release.sgml
+++ b/doc/src/sgml/release.sgml
@@ -70,27 +70,78 @@ For new features, add links to the documentation sections.
   </para>
 
 <!--
-  To add a new major-release series, add an entry here and in filelist.sgml.
+  When beginning a new major-release series, create a new release-N.sgml
+  file and replace the previous one with a link to the on-line documentation
+  for that branch.  Don't forget to update filelist.sgml.
 
-  The reason for splitting the release notes this way is so that appropriate
-  subsets can easily be copied into back branches.
+  The reason for keeping each branch's release notes in a differently-named
+  file is to reduce confusion when preparing minor-release updates.
+  All the active branches have to be edited concurrently when doing that.
 -->
+
 &release-12;
-&release-11;
-&release-10;
-&release-9.6;
-&release-9.5;
-&release-9.4;
-&release-9.3;
-&release-9.2;
-&release-9.1;
-&release-9.0;
-&release-8.4;
-&release-8.3;
-&release-8.2;
-&release-8.1;
-&release-8.0;
-&release-7.4;
-&release-old;
+
+ <sect1 id="release-prior">
+  <title>Prior Releases</title>
+
+  <para>
+   Release notes for currently-supported previous release series can be
+   found at:
+
+   <itemizedlist>
+    <listitem>
+     <para>
+      <productname>PostgreSQL</productname> 11:
+      <ulink url="https://www.postgresql.org/docs/11/release.html">
+       <literal>https://www.postgresql.org/docs/11/release.html</literal>
+      </ulink>
+     </para>
+    </listitem>
+
+    <listitem>
+     <para>
+      <productname>PostgreSQL</productname> 10:
+      <ulink url="https://www.postgresql.org/docs/10/release.html">
+       <literal>https://www.postgresql.org/docs/10/release.html</literal>
+      </ulink>
+     </para>
+    </listitem>
+
+    <listitem>
+     <para>
+      <productname>PostgreSQL</productname> 9.6:
+      <ulink url="https://www.postgresql.org/docs/9.6/release.html">
+       <literal>https://www.postgresql.org/docs/9.6/release.html</literal>
+      </ulink>
+     </para>
+    </listitem>
+
+    <listitem>
+     <para>
+      <productname>PostgreSQL</productname> 9.5:
+      <ulink url="https://www.postgresql.org/docs/9.5/release.html">
+       <literal>https://www.postgresql.org/docs/9.5/release.html</literal>
+      </ulink>
+     </para>
+    </listitem>
+
+    <listitem>
+     <para>
+      <productname>PostgreSQL</productname> 9.4:
+      <ulink url="https://www.postgresql.org/docs/9.4/release.html">
+       <literal>https://www.postgresql.org/docs/9.4/release.html</literal>
+      </ulink>
+     </para>
+    </listitem>
+   </itemizedlist>
+  </para>
+
+  <para>
+   Release notes for out-of-support release series can be found at
+   <ulink url="https://www.postgresql.org/docs/manuals/archive/">
+    <literal>https://www.postgresql.org/docs/manuals/archive/</literal>
+   </ulink>
+  </para>
+ </sect1>
 
 </appendix>