[Petal] metal:use-macro should be TALES?

[adam]

Howdy.

I'm fairly new to petal, and have been battling through the standard
problems (overcoming my aversion to &s in hrefs, javascript stuff etc
etc), but am stumped on the latest one.

Basically I want to choose which metal template to use at run-time, using
something along the lines of

metal:use-macro="dat/header" or
metal:use-macro="foo/${dat/bar}/baz.xml" or
metal:use-macro="string: dat/header"

Is this supported? Should I be doing something entirely different?

Thanks for your help,
--
Adam
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