[ZPT] changing the order of operations

[Chris Withers]

Fred L. Drake, Jr. wrote:

> Jamie pointed out why you'd want both when you give an expression to
> tal:omit-tag, 

Indeed. Think a username where you want to make it an <a href="mailto:"> to send 
that person an email when you click on their name. You don't want the name to be 
a link if you don't have an email address for them ;-)

 > but it probably is an error

Sorry, lost me, what is 'it' here?

> when using tal:omit-tag="",
> and that's a common case.

Yeah, but I think most people prefer just to shove stuff into the tal: or metal: 
namespaces nowadays:

<tal:username content="username">Fred</tal:username>

Hang on, actually, doesn't tal:omit-tag="" mean that the tag is _always_ included?

I've often wished TAL had an include-tag command instead:

<a href=""
    tal:include-tag="here/email"
    tal:attributes="href string:mailto:${here/email}
    tal:content="here/username">Fred</a>

But, if that's how tal:omit-tag works, then it's just plain wrong :-(

Can someone help my brain out here?

cheers,

Chris