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

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

i have found pl/sql code can't find in oracle documentation valid:

create or replace procedure hard_priv 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;

thanks

oracle plsql