Hello Tatsuo-san,
Minor suggestions, although I'm not a native English speaker.
> In libpq.sgml following is stated:
>
> Before <productname>PostgreSQL</productname> protocol 3.0, it was necessary
> for the application to explicitly send the two characters
> <literal>\.</literal> as a final line to indicate to the server that it
ISTM That "it" may refer to the server... Put "the application" instead?
> had
> finished sending <command>COPY</command> data. While this still works, it is deprecated and the
> special meaning of <literal>\.</literal> can be expected to be removed in a
> future release.
Maybe be more assertive, "will be removed"?
> It is sufficient to call <function>PQendcopy</function> after
"It is now sufficient ..."?
> having sent the actual data.
>
> I think this should be mentioned in protocol.sgml as well. Developers
> who wish to develop programs that understand frontend/backend protocol
> should be able to focus on protocol.sgml. Attached is a patch for
> this.
--
Fabien.