What is the meaning of "(." and ".)" in PL/SQL? - oracle

Question

I have found this PL/SQL code but I can't find in Oracle documentation to be valid:
CREATE OR REPLACE PROCEDURE hard_priv AS
BEGIN
HTP.htmlOpen;
HTP.headOpen;
HTP.title (.Account Information.);
HTP.headClose;
HTP.bodyOpen;
HTP.br;
HTP.print('User ID: ' ||
OWA_SEC.get_user_id || '');
HTP.print('User Password: ' ||
OWA_SEC.get_password || '');
HTP.br;
HTP.bodyClose;
HTP.htmlClose;
END hard_priv;
END uu_hr_pkg;

Answer 1

"(." and ".)" is not PLSQL syntax.
So it cannot compile.
This simple:
begin
dbms_output.put_line('this is the right syntax');
dbms_output.put_line(.this_dont_work.);
end;
/
Gives a compilation error like that:
SQL> #a
dbms_output.put_line(.this_dont_work.);
*
ERROR at line 3:
ORA-06550: line 3, column 26:
PLS-00103: Encountered the symbol "." when expecting one of the following:
( ) - + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable> table continue avg count current exists max min prior sql
stddev sum variance execute multiset the both leading
trailing forall merge year month day hour minute second
timezone_hour timezone_minute timezone_region timezone_abbr
time timestamp interval date
In the real world, you must replace them with '; your thing should be:
CREATE OR REPLACE PROCEDURE hard_priv AS
BEGIN
HTP.htmlOpen;
HTP.headOpen;
HTP.title ('Account Information');
HTP.headClose;
....