Lisp concrete syntax -- was: Namespaces and DTDs

[Rick Jelliffe]

 You can make LISP into SGML by short-reffing
    ( to "<sexp><car>"
    ) to "</sexp>"
allowing end-tag ommission on the car element and cdr element type, 
and within a car element type, short-ref white-space to "</car><cdr>".
Depending on the kind of LISP, you may need to also handle
quotes and other delimiters, to taste.

This marks up  
    (+ 1 1)
as
    <sexp><car>+</car><cdr>1 1</cdr></sexp>
which is a nice start for parsing. (If you think cad and cdr
would be confusing, use some other name.)

You could indeed continue this and get
<sexp>
    <car>+</car>
    <cdr><car>1</car><cdr>1</cdr></cdr>
</sexp>

Rick Jelliffe


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