<term>Int32 (Oid)</term>
       <listitem>
        <para>
         OID of the relation corresponding to the ID in the relation
         message.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte1('K')</term>
       <listitem>
        <para>
         Identifies the following TupleData submessage as a key.
         This field is optional and is only present if
         the update changed data in any of the column(s) that are
         part of the REPLICA IDENTITY index.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte1('O')</term>
       <listitem>
        <para>
         Identifies the following TupleData submessage as an old tuple.
         This field is optional and is only present if table in which
         the update happened has REPLICA IDENTITY set to FULL.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>TupleData</term>
       <listitem>
        <para>
         TupleData message part representing the contents of the old tuple
         or primary key. Only present if the previous 'O' or 'K' part
         is present.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte1('N')</term>
       <listitem>
        <para>
         Identifies the following TupleData message as a new tuple.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>TupleData</term>
       <listitem>
        <para>
         TupleData message part representing the contents of a new tuple.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>

     <para>
      The Update message may contain either a 'K' message part or an 'O' message part
      or neither of them, but never both of them.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-logicalrep-message-formats-Delete">
    <term>Delete</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('D')</term>
       <listitem>
        <para>
         Identifies the message as a delete message.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32 (TransactionId)</term>
       <listitem>
        <para>
         Xid of the transaction (only present for streamed transactions).
         This field is available since protocol version 2.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32 (Oid)</term>
       <listitem>
        <para>
         OID of the relation corresponding to the ID in the relation
         message.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte1('K')</term>
       <listitem>
        <para>
         Identifies the following TupleData submessage as a key.
         This field is present if the table in which the delete has
         happened uses an index as REPLICA IDENTITY.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Byte1('O')</term>
       <listitem>
        <para>
         Identifies the following TupleData message as an old tuple.
         This field is present if the table in which the delete
         happened has REPLICA IDENTITY set to FULL.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>TupleData</term>
       <listitem>
        <para>
         TupleData message part representing the contents of the old tuple
         or primary key, depending on the previous field.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>

     <para>
      The Delete message may contain either a 'K' message part or an 'O' message part,
      but never both of them.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-logicalrep-message-formats-Truncate">
    <term>Truncate</term>
    <listitem>
     <variablelist>
      <varlistentry>