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doc: Add more ICU rules examples

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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
This commit is contained in:
Peter Eisentraut
2023-08-23 11:23:42 +02:00
parent 27a36f79b6
commit 17ec2c5dfa
3 changed files with 62 additions and 13 deletions
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13
doc/src/sgml/ref/create_collation.sgml
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@@ -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>