<listitem>
        <para>
         Current backend transaction status indicator.
         Possible values are '<literal>I</literal>' if idle (not in
         a transaction block); '<literal>T</literal>' if in a transaction
         block; or '<literal>E</literal>' if in a failed transaction
         block (queries will be rejected until block is ended).
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-RowDescription">
    <term>RowDescription (B)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('T')</term>
       <listitem>
        <para>
         Identifies the message as a row description.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Length of message contents in bytes, including self.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         Specifies the number of fields in a row (can be zero).
        </para>
       </listitem>
      </varlistentry>
     </variablelist>

     <para>
      Then, for each field, there is the following:
     </para>

     <variablelist>
      <varlistentry>
       <term>String</term>
       <listitem>
        <para>
         The field name.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         If the field can be identified as a column of a specific
         table, the object ID of the table; otherwise zero.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         If the field can be identified as a column of a specific
         table, the attribute number of the column; otherwise zero.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         The object ID of the field's data type.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         The data type size (see <varname>pg_type.typlen</varname>).
         Note that negative values denote variable-width types.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         The type modifier (see <varname>pg_attribute.atttypmod</varname>).
         The meaning of the modifier is type-specific.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         The format code being used for the field.  Currently will
         be zero (text) or one (binary).  In a RowDescription
         returned from the statement variant of Describe, the
         format code is not yet known and will always be zero.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-SASLInitialResponse">
    <term>SASLInitialResponse (F)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('p')</term>
       <listitem>
        <para>
         Identifies the message as an initial SASL response. Note that
         this is also used for GSSAPI, SSPI and password response messages.
         The exact message type is deduced from the context.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int32</term>
       <listitem>
        <para>
         Length of message contents in bytes, including self.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>String</term>
       <listitem>
        <para>
         Name of the SASL authentication