Comment 3 for bug 180980

I removed xmlns:metal and xmlns:tal from a page template, and it worked fine. So I don't think it's correct to say they're needed by Zope to execute the PageTemplate correctly. (Indeed, Launchpad ran successfully for a couple of years without them.)

Even if they were needed, that would still be brittle code duplication, which should be fixed in Zope so that the duplication could be removed from Launchpad.