Expressive Data in Lisp Lists based on Programming in an Interactive Environment [Erik SandeWall,1978].

I came across this little snippet and was impressed by the degree of isomorphism between s-expressions and markup languages such as XML.

(( (JAN 12 2014) ((9 15) (10 00) (SEE ANDERSON)) ((10 45) (11 00) (SEE LUNDSTROM)) ((13 15) (16 00) (ATTEND Y COMMITTEE MEETING))) (( (JAN 13 2014) ((9 30) (10 00) (ATTEND NEW PRODUCTS PRESENTATION)))

I was primed for the idea by Slava Akhmechet’s article “The Nature of Lisp” which I found by looking at HackerNews item 10000 – which was a comment on the article.