\centerline{\bf Hello World}
\vskip .5cm
This is a very simple example of the WEB system.

@ First, we define a text to be displayed.
 
@<Content to print@>=
'Hello, Literate Programming!'

@ This is the mainprogram of the Pascal program.
An expression surrounded by $\langle$ and $\rangle$
is substituted by its definition.

@p
Program HelloWorld(output);
begin
  @<Do something inside a program@>
end.

@ You can define an identifier after reference in WEB language.
@<Do something inside a program@>=
writeLn( @<Content to print@> )