<para>
         Identifies the message as a Start Copy In response.
         The frontend must now send copy-in data (if not
         prepared to do so, send a CopyFail message).
        </para>
       </listitem>
      </varlistentry>

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

      <varlistentry>
       <term>Int8</term>
       <listitem>
        <para>
         0 indicates the overall <command>COPY</command> format is textual (rows
         separated by newlines, columns separated by separator
         characters, etc.).
         1 indicates the overall copy format is binary (similar
         to DataRow format).
         See <xref linkend="sql-copy"/>
         for more information.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         The number of columns in the data to be copied
         (denoted <replaceable>N</replaceable> below).
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16[<replaceable>N</replaceable>]</term>
       <listitem>
        <para>
         The format codes to be used for each column.
         Each must presently be zero (text) or one (binary).
         All must be zero if the overall copy format is textual.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-CopyOutResponse">
    <term>CopyOutResponse (B)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('H')</term>
       <listitem>
        <para>
         Identifies the message as a Start Copy Out response.
         This message will be followed by copy-out data.
        </para>
       </listitem>
      </varlistentry>

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

      <varlistentry>
       <term>Int8</term>
       <listitem>
        <para>
         0 indicates the overall <command>COPY</command> format
         is textual (rows separated by newlines, columns
         separated by separator characters, etc.). 1 indicates
         the overall copy format is binary (similar to DataRow
         format). See <xref linkend="sql-copy"/> for more information.
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16</term>
       <listitem>
        <para>
         The number of columns in the data to be copied
         (denoted <replaceable>N</replaceable> below).
        </para>
       </listitem>
      </varlistentry>

      <varlistentry>
       <term>Int16[<replaceable>N</replaceable>]</term>
       <listitem>
        <para>
         The format codes to be used for each column.
         Each must presently be zero (text) or one (binary).
         All must be zero if the overall copy format is textual.
        </para>
       </listitem>
      </varlistentry>
     </variablelist>
    </listitem>
   </varlistentry>

   <varlistentry id="protocol-message-formats-CopyBothResponse">
    <term>CopyBothResponse (B)</term>
    <listitem>
     <variablelist>
      <varlistentry>
       <term>Byte1('W')</term>
       <listitem>
        <para>
         Identifies the message as a Start Copy Both response.
         This message is used only for Streaming Replication.
        </para>
       </listitem>
      </varlistentry>

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

      <varlistentry>
       <term>Int8</term>
       <listitem>
        <para>
         0 indicates the overall <command>COPY</command>