Re: checked attribute for a checkbox input

At 02:37 PM 3/18/2004, JP Massar wrote:


>>I use a snippet like
>>(NET.HTML.GENERATOR:HTML
>>          ((:input :type "Checkbox"
>>                   :name id
>>                   :value aValue
>>                   :if* (my-lisp-function aValue) :checked "CHECKED"
>>                   )
>>           (:princ aValue)
>>           :newline
>>           )
>>          )
>
>Is this (and anything else like it) documented somewhere?
>
>A quick perusal of the Allegroserve tutorial and manual don't
>reveal anything obviously relevant to this.
>

Let me clarify:  Is the necessity of the use of :if* documented anywhere?

And in what other similar contexts is it necessary to use it?