[Petal] Neato Tricks That Aren't Documented Anywhere

[Fergal Daly]

On Thu, Jan 13, 2005 at 12:13:55PM -0600, Warren Smith wrote:
> Up until now, if I wanted to use petal to pre-select and item in a
> After reading the Petal source, I found that if you use petal:attributes
> to assign an attribute an undefined value, the attribute gets omitted,
> thusly:

This is required by the TAL spec

         http://www.zope.org/Wikis/DevSite/Projects/ZPT/TAL

so although it may not be mentioned in the Petal man page, it is documented.
There are probably a couple of other bits and pieces like this,

Fergal