From 17ec2c5dfa8dc6fee3df749d214238d34ee681c9 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Wed, 23 Aug 2023 11:23:42 +0200
Subject: doc: Add more ICU rules examples

In particular, add an example EBCDIC collation.

Author: Daniel Verite <daniel@manitou-mail.org>
Discussion: https://www.postgresql.org/message-id/flat/35cc1684-e516-4a01-a256-351632d47066@manitou-mail.org
---
 doc/src/sgml/ref/create_collation.sgml | 13 ++++---------
 doc/src/sgml/ref/create_database.sgml  |  4 +---
 2 files changed, 5 insertions(+), 12 deletions(-)

(limited to 'doc/src/sgml/ref')

diff --git a/doc/src/sgml/ref/create_collation.sgml b/doc/src/sgml/ref/create_collation.sgml
index b86a9bbb9ce..5cf9777764b 100644
--- a/doc/src/sgml/ref/create_collation.sgml
+++ b/doc/src/sgml/ref/create_collation.sgml
@@ -165,9 +165,8 @@ CREATE COLLATION [ IF NOT EXISTS ] <replaceable>name</replaceable> FROM <replace
      <listitem>
       <para>
        Specifies additional collation rules to customize the behavior of the
-       collation.  This is supported for ICU only.  See <ulink
-       url="https://unicode-org.github.io/icu/userguide/collation/customization/"/>
-       for details on the syntax.
+       collation.  This is supported for ICU only.  See <xref
+       linkend="icu-tailoring-rules"/> for details.
       </para>
      </listitem>
     </varlistentry>
@@ -257,12 +256,8 @@ CREATE COLLATION german_phonebook (provider = icu, locale = 'de-u-co-phonebk');
 <programlisting>
 <![CDATA[CREATE COLLATION custom (provider = icu, locale = 'und', rules = '&V << w <<< W');]]>
 </programlisting>
-   With this rule, the letter <quote>W</quote> is sorted after
-   <quote>V</quote>, but is treated as a secondary difference similar to an
-   accent.  Rules like this are contained in the locale definitions of some
-   languages.  (Of course, if a locale definition already contains the desired
-   rules, then they don't need to be specified again explicitly.)  See the ICU
-   documentation for further details and examples on the rules syntax.
+   See <xref linkend="icu-tailoring-rules"/> for further details and examples
+   on the rules syntax.
   </para>
 
   <para>
diff --git a/doc/src/sgml/ref/create_database.sgml b/doc/src/sgml/ref/create_database.sgml
index b2c8aef1ad2..ce7317f81ba 100644
--- a/doc/src/sgml/ref/create_database.sgml
+++ b/doc/src/sgml/ref/create_database.sgml
@@ -232,9 +232,7 @@ CREATE DATABASE <replaceable class="parameter">name</replaceable>
        <para>
         Specifies additional collation rules to customize the behavior of the
         default collation of this database.  This is supported for ICU only.
-        See <ulink
-        url="https://unicode-org.github.io/icu/userguide/collation/customization/"/>
-        for details on the syntax.
+        See <xref linkend="icu-tailoring-rules"/> for details.
        </para>
       </listitem>
      </varlistentry>
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