Re: How to extend a function?

[Norman Walsh <ndw@xxxxxxxxxx>]

| Assumed the style sheet had something like
| 
| (define (xyz a)
|  (cond
|   ((equal? a "X") #f)
|   (else #t)))
| 
| Now I want to "use" that style sheet and say
| 
| (define (xyz a)
|  (cond
|   ((equal? a "Y") #f)
|   (else (xzy a))))
| 
| The last call should go to the first definition.  Possible?

I don't think so. But, if you can frame the problem in terms of
construction rules, you can call next-match.

For example, if you wanted to put square brackets around commands,
but you wanted the presentation of commands otherwise unchanged,
you could put the following in your stylesheet:

(element command
  (make sequence
    (literal "[")
    (next-match)
    (literal "]")))

                                        Cheers,
                                          norm
-- 
Norman Walsh <ndw@xxxxxxxxxx>      | No man's knowledge here can go
http://nwalsh.com/                 | beyond his experience.--John Locke


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