[[!comment format=mdwn
 username="http://joey.kitenet.net/"
 nickname="joey"
 subject="comment 1"
 date="2011-09-05T17:33:51Z"
 content="""
Plugins can be written that do this kind of arbitrary transformation. For
example, the smiley plugin does.

However, this is not usual in ikiwiki, instead there is a specific syntax for a [[ikiwiki/directive]] that is used consistently for a great many things of this sort.
"""]]