(Fifth attempt: diff inline)
(And a fourth attempt, from another account...)
(Third time's the charm?)
(Resent as I sent this yesterday but haven't seen it on the list yet or in the online archives. Apologies if it ends up double-posting.)

Please find attached a doc patch for CREATE CONSTRAINT TRIGGER. The documentation here has always been sparse, as the command isn't intended for general use. However, in its current form its a bit *too* sparse. For example, it mentions constraint attributes but doesn't say what those might be or where to look for information for details. The patch lists attribute options and provides references to where those options are described.

When looking in gram.y while trying to figure out what exactly was meant by "actual constraint specification", I discovered OptConstrFromTable. I assume this means Optional Constraint From Table and it looks like it's used to specify the referenced table a foreign key constraint. I couldn't figure out how to meaningfully use it and have left the description purposefully vague.

I don't have a working DocBook tool chain on my system, so I haven't been able to check if it builds properly. I tried to be conscientious about my formatting, but some SGML bugs may have crept in.

Thanks!

Michael Glaesemann
grzm myrealbox com

Index: doc/src/sgml/ref/create_constraint.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/ create_constraint.sgml,v
retrieving revision 1.14
diff -c -r1.14 create_constraint.sgml
*** doc/src/sgml/ref/create_constraint.sgml 16 Sep 2006 00:30:17 -0000 1.14
--- doc/src/sgml/ref/create_constraint.sgml     7 Oct 2006 03:53:18 -0000
***************
*** 21,29 ****
   <refsynopsisdiv>
  <synopsis>
CREATE CONSTRAINT TRIGGER <replaceable class="parameter">name</ replaceable>
!     AFTER <replaceable class="parameter">events</replaceable> ON
! <replaceable class="parameter">tablename</replaceable> <replaceable class="parameter">constraint</replaceable> <replaceable class="parameter">attributes</replaceable> ! FOR EACH ROW EXECUTE PROCEDURE <replaceable class="parameter">funcname</replaceable> ( <replaceable class="parameter">args</replaceable> )
  </synopsis>
   </refsynopsisdiv>

--- 21,32 ----
   <refsynopsisdiv>
  <synopsis>
CREATE CONSTRAINT TRIGGER <replaceable class="parameter">name</ replaceable> ! AFTER <replaceable class="parameter">event [ OR ... ]</ replaceable>
!     ON <replaceable class="parameter">table_name</replaceable>
! [ FROM <replaceable class="parameter">referenced_table_name</ replaceable> ] ! { NOT DEFERRABLE | [ DEFERABBLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } }
!     FOR EACH ROW
! EXECUTE PROCEDURE <replaceable class="parameter">funcname</ replaceable> ( <replaceable class="parameter">arguments</replaceable> )
  </synopsis>
   </refsynopsisdiv>

***************
*** 33,102 ****
    <para>
     <command>CREATE CONSTRAINT TRIGGER</command> is used within
<command>CREATE TABLE</command>/<command>ALTER TABLE</command> and by ! <application>pg_dump</application> to create the special triggers for
!    referential  integrity.
     It is not intended for general use.
    </para>
   </refsect1>

   <refsect1>
!    <title>Parameters</title>
!               
!     <variablelist>
!      <varlistentry>
!       <term><replaceable class="PARAMETER">name</replaceable></term>
!       <listitem>
!        <para>
!       The name of the constraint trigger.
!        </para>
!       </listitem>
!      </varlistentry>
!
!      <varlistentry>
!       <term><replaceable class="PARAMETER">events</replaceable></term>
!       <listitem>
!        <para>
!       The event categories for which this trigger should be fired.
!        </para>
!       </listitem>
!      </varlistentry>
!
!      <varlistentry>
! <term><replaceable class="PARAMETER">tablename</replaceable></ term>
!       <listitem>
!        <para>
!       The name (possibly schema-qualified) of the table in which
!       the triggering events occur.
!        </para>
!       </listitem>
!      </varlistentry>
!
!      <varlistentry>
! <term><replaceable class="PARAMETER">constraint</ replaceable></term>
!       <listitem>
!        <para>
!       Actual constraint specification.
!        </para>
!       </listitem>
!      </varlistentry>
!
!      <varlistentry>
! <term><replaceable class="PARAMETER">attributes</ replaceable></term>
!       <listitem>
!        <para>
!       The constraint attributes.
!        </para>
!       </listitem>
!      </varlistentry>
!
!      <varlistentry>
! <term><replaceable class="PARAMETER">funcname</replaceable> (<replaceable class="PARAMETER">args</replaceable>)</term>
!       <listitem>
!        <para>
!       The function to call as part of the trigger processing.
!        </para>
!       </listitem>
!      </varlistentry>
!     </variablelist>
   </refsect1>
  </refentry>
--- 36,128 ----
    <para>
     <command>CREATE CONSTRAINT TRIGGER</command> is used within
<command>CREATE TABLE</command>/<command>ALTER TABLE</command> and by ! <application>pg_dump</application> to create the special triggers for
!    referential integrity.
     It is not intended for general use.
    </para>
   </refsect1>

   <refsect1>
!   <title>Parameters</title>
!
!   <variablelist>
!    <varlistentry>
!     <term><replaceable class="PARAMETER">name</replaceable></term>
!     <listitem>
!      <para>
!       The name of the constraint trigger. The actual name of the
!       created trigger will be of the form
! <literal>RI_ConstraintTrigger_0000<literal> (where 0000 is some number
!       assigned by the server).
!       Use this assigned name is when dropping the constraint.
!      </para>
!     </listitem>
!    </varlistentry>
!
!    <varlistentry>
!     <term><replaceable class="PARAMETER">events</replaceable></term>
!     <listitem>
!      <para>
!       One of <literal>INSERT</literal>, <literal>UPDATE</literal>, or
! <literal>DELETE</literal>; this specifies the event that will fire the ! trigger. Multiple events can be specified using <literal>OR<literal>.
!      </para>
!     </listitem>
!    </varlistentry>
!
!    <varlistentry>
! <term><replaceable class="PARAMETER">table_name</replaceable></ term>
!     <listitem>
!      <para>
!       The (possibly schema-qualified) name of the table in which
!       the triggering events occur.
!      </para>
!     </listitem>
!    </varlistentry>
!
!    <varlistentry>
! <term><replaceable class="PARAMETER">referenced_table_name</ replaceable></term>
!     <listitem>
!      <para>
! The (possibly schema-qualified) name of the table referenced by the
!       constraint. Used by foreign key constraints triggers.
!      </para>
!     </listitem>
!    </varlistentry>
!
!    <varlistentry>
!     <term><literal>DEFERRABLE</literal></term>
!     <term><literal>NOT DEFERRABLE</literal></term>
!     <term><literal>INITIALLY IMMEDIATE</literal></term>
!     <term><literal>INITIALLY DEFERRED</literal></term>
!     <listitem>
!      <para>
! See the <xref linkend="SQL-CREATETABLE" endterm="SQL- CREATETABLE-TITLE">
!       documentation for details of these constraint options.
!      </para>
!     </listitem>
!    </varlistentry>
!
!    <varlistentry>
! <term><replaceable class="PARAMETER">funcname</replaceable> (<replaceable class="PARAMETER">args</replaceable>)</term>
!     <listitem>
!      <para>
! The function to call as part of the trigger processing. See <xref ! linkend="SQL-CREATETRIGGER" endterm="SQL-CREATETRIGGER- TITLE"> for
!       details.
!      </para>
!     </listitem>
!    </varlistentry>
!   </variablelist>
   </refsect1>
+
+  <refsect1 id="SQL-CREATECONSTRAINT">
+   <title>Compatibility</title>
+   <para>
+    <command>CREATE CONTRAINT TRIGGER</command> is a
+ <productname>PostgreSQL</productname> extension of the <acronym>SQL</>
+    standard.
+   </para>
+  </refsect1>
+
  </refentry>


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