[ZPT] Extending tal:condition, making metal:define

[Evan Simpson]

From: "Guido van Rossum" <guido@digicool.com>
> Maybe, but your initial post here *wanted* an else, and you solved it
> with two conditions, the second being the reverse of the first.  That
> also violates the WYSIWYG principle.

I only did that because we didn't have a way to spell "leave the example
text alone".  The lazy: proposal looks like it may be a decent spelling,
especially if we can come up with a better name for it ;-)

Cheers,

Evan @ digicool