Thanks very much.
A nice and clear answer.
May be I can insert tagged elements and elemrefs in code:comment escaping with 
#,
in order to provide links to definitions in previous examples.
I'll try that later.
Thanks again, Jos

  _____  

From: Ben Greenman [mailto:benjaminlgreen...@gmail.com] 
Sent: domingo, 24 de septiembre de 2017 6:45
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] repeated code in interactions of scribble


You can re-use helper functions by running the different example blocks with 
the same evaluator (example below). 

I don't know how to hyperlink one interaction to another.

- - -

#lang scribble/manual
@require[scribble/example]


@(define my-eval (make-base-eval))


Beginning.


@examples[#:eval my-eval
  (define (plus2 n)
    (+ 2 n))
  (plus2 0)
  (plus2 1)
]


Intermission.


@examples[#:eval my-eval
  (define (plus4 n)
    (plus2 (plus2 n)))
  (plus4 0)
]


Conclusion.

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