doc: Replace list of drivers and PLs with wiki link

The list of external language drivers and procedural languages was
never complete or exhaustive, and rather than attempting to manage
it the content has migrated to the wiki.  This replaces the tables
altogether with links to the wiki as we regularly get requests for
adding various projects,  which we reject without any clear policy
for why or how the content should be managed.

The threads linked to below are the most recent discussions about
this, the archives contain many more.

Backpatch to all supported branches since the list on the wiki
applies to all branches.

Author: Jonathan Katz <jkatz@postgresql.org>
Discussion: https://postgr.es/m/169165415312.635.10247434927885764880@wrigleys.postgresql.org
Discussion: https://postgr.es/m/169177958824.635.11087800083040275266@wrigleys.postgresql.org
Backpatch-through: v11

1 files changed, 18 insertions, 140 deletions

diff --git a/doc/src/sgml/external-projects.sgml b/doc/src/sgml/external-projects.sgml
index bf590aba5d9..50872dfd88e 100644
--- a/doc/src/sgml/external-projects.sgml
+++ b/doc/src/sgml/external-projects.sgml
@@ -40,99 +40,17 @@
    </itemizedlist>
 
    All other language interfaces are external projects and are distributed
-   separately. <xref linkend="language-interface-table"/> includes a list of
-   some of these projects. Note that some of these packages might not be
-   released under the same license as <productname>PostgreSQL</productname>. For more
-   information on each language interface, including licensing terms, refer to
-   its website and documentation.
+   separately. A
+   <ulink url="https://wiki.postgresql.org/wiki/List_of_drivers">list of language interfaces</ulink>
+   is maintained on the PostgreSQL wiki. Note that some of these packages are
+   not released under the same license as <productname>PostgreSQL</productname>.
+   For more information on each language interface, including licensing terms,
+   refer to its website and documentation.
   </para>
 
-  <table id="language-interface-table">
-   <title>Externally Maintained Client Interfaces</title>
-
-   <tgroup cols="4">
-    <thead>
-     <row>
-      <entry>Name</entry>
-      <entry>Language</entry>
-      <entry>Comments</entry>
-      <entry>Website</entry>
-     </row>
-    </thead>
-
-    <tbody>
-     <row>
-      <entry>DBD::Pg</entry>
-      <entry>Perl</entry>
-      <entry>Perl DBI driver</entry>
-      <entry><ulink url="https://metacpan.org/release/DBD-Pg"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>JDBC</entry>
-      <entry>Java</entry>
-      <entry>Type 4 JDBC driver</entry>
-      <entry><ulink url="https://jdbc.postgresql.org/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>libpqxx</entry>
-      <entry>C++</entry>
-      <entry>C++ interface</entry>
-      <entry><ulink url="https://pqxx.org/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>node-postgres</entry>
-      <entry>JavaScript</entry>
-      <entry>Node.js driver</entry>
-      <entry><ulink url="https://node-postgres.com/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>Npgsql</entry>
-      <entry>.NET</entry>
-      <entry>.NET data provider</entry>
-      <entry><ulink url="https://www.npgsql.org/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>pgtcl</entry>
-      <entry>Tcl</entry>
-      <entry></entry>
-      <entry><ulink url="https://github.com/flightaware/Pgtcl"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>pgtclng</entry>
-      <entry>Tcl</entry>
-      <entry></entry>
-      <entry><ulink url="https://sourceforge.net/projects/pgtclng/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>pq</entry>
-      <entry>Go</entry>
-      <entry>Pure Go driver for Go's database/sql</entry>
-      <entry><ulink url="https://github.com/lib/pq"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>psqlODBC</entry>
-      <entry>ODBC</entry>
-      <entry>ODBC driver</entry>
-      <entry><ulink url="https://odbc.postgresql.org/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>psycopg</entry>
-      <entry>Python</entry>
-      <entry>DB API 2.0-compliant</entry>
-      <entry><ulink url="https://www.psycopg.org/"></ulink></entry>
-     </row>
-    </tbody>
-   </tgroup>
-  </table>
+  <para>
+    <ulink url="https://wiki.postgresql.org/wiki/List_of_drivers"></ulink>
+  </para>
  </sect1>
 
  <sect1 id="external-admin-tools">
@@ -170,58 +88,18 @@
   <para>
    In addition, there are a number of procedural languages that are developed
    and maintained outside the core <productname>PostgreSQL</productname>
-   distribution. <xref linkend="pl-language-table"/> lists some of these
-   packages. Note that some of these projects might not be released under the same
-   license as <productname>PostgreSQL</productname>. For more information on each
-   procedural language, including licensing information, refer to its website
+   distribution. A list of
+   <ulink url="https://wiki.postgresql.org/wiki/PL_Matrix">procedural languages</ulink>
+   is maintained on the PostgreSQL wiki. Note that some of these projects are
+   not released under the same license as <productname>PostgreSQL</productname>.
+   For more information on each procedural language, including licensing
+   information, refer to its website
    and documentation.
   </para>
 
-  <table id="pl-language-table">
-   <title>Externally Maintained Procedural Languages</title>
-
-   <tgroup cols="3">
-    <thead>
-     <row>
-      <entry>Name</entry>
-      <entry>Language</entry>
-      <entry>Website</entry>
-     </row>
-    </thead>
-
-    <tbody>
-     <row>
-      <entry>PL/Java</entry>
-      <entry>Java</entry>
-      <entry><ulink url="https://tada.github.io/pljava/"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>PL/Lua</entry>
-      <entry>Lua</entry>
-      <entry><ulink url="https://github.com/pllua/pllua-ng"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>PL/R</entry>
-      <entry>R</entry>
-      <entry><ulink url="https://github.com/postgres-plr/plr"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>PL/sh</entry>
-      <entry>Unix shell</entry>
-      <entry><ulink url="https://github.com/petere/plsh"></ulink></entry>
-     </row>
-
-     <row>
-      <entry>PL/v8</entry>
-      <entry>JavaScript</entry>
-      <entry><ulink url="https://github.com/plv8/plv8"></ulink></entry>
-     </row>
-    </tbody>
-   </tgroup>
-  </table>
+  <para>
+   <ulink url="https://wiki.postgresql.org/wiki/PL_Matrix"></ulink>
+  </para>
  </sect1>
 
  <sect1 id="external-extensions">