multiple delay alternative

[Mehdi Saada <00120260a@gmail.com>]

Hello !

In https://perso.telecom-paristech.fr/pautet/Ada95/chap28.htm, Ada tutorial's paragraph on the delayed rendezvous, it says the general form of this construct is:
select 
         delay <time>;
         <entry call>;
    or 
         delay <time>;
         <entry call>;
    or
         delay <time>;
         <entry call>;
    end select;

But in the RM timed entry calls are featured like this:
timed_entry_call ::= 
  select
   entry_call_alternative
  or
   delay_alternative
  end select;

What should I understand ?
I have trouble understanding the first construct, otherwise than "if nothing happens before n seconds, do that, AND THEN, if nothing happens before n2 seconds, do that, etc... as if
select
     delay 11.0;
     A;
or
     delay 12.0
     B;
end select;

is equivalent to
delay 10.0
select
     delay 1.0;
or
     delay 2.0;
end select;
But it's likely that I didn't guess right.