On: Produce HTML from S-Expressions

[em-bee]

you would normally quote the whole s-expression to make sure it is interpreted as data only. '(look at this: no variables)

[Zambyte → em-bee]

To expand on this, Lisps also usually have a quasiquotation system to make it easy to embed data from the host system into an s-exp. `(look ,(get-parent): some variables like ,x)