[DGD] Re: parse string difficulties

[Robert Forshaw]

>From: Erwin Harte <harte at is-here.com>
>Hope this gets you a few steps further in the right direction.  I'm
>not going to write a full-blown introduction because I think there are
>other resources out there that explain grammars better than I can. :-)

Your explanation was just fine, but there is one other thing I'm wondering 
about, here:


>Then the production rules come into play.  Beginning at the bottom,
>basically.
>
>The parse_string() code might for instance say "Hey, that set of
><operator> <word> <newline> at the end, I can match that to an
>OPERATION rule, let's see what happens if I use that."
>
>That means that fun_3 is presented with a 'mixed *tree' parameter that
>has as value
.....

If this is the case, what is the point in having production rules that don't 
call functions?

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