Way off topic (was: Lisp concrete syntax)
ricko at allette.com.au
Tue Mar 16 23:27:26 GMT 1999
>Not to be a pest or anything, shouldn't this be...
There are three things we could be notating:
* parsing the s-expression source code;
* fully expanding the notional LISP lists;
* exposing the implementation.
The form I gave parses the s-expression. The version you give shows the
fully expanded list. And if an implementation used cdr-coding, it would
look like my version; if it used explicit nulls, it would look like your
This is a good example that XML markup is not a data modeling language,
but a data-model modeling language :-) The lexical, semantic and
implementation structures of a programming language are all different,
and a XML document could reflect any of them (or even a mix).
P.S. For more on cdr-coding, refer
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