[Zope] About the Page template features

[Gilles Lenfant]

Hi,

When tailoring the various Page Templates in a Plone site, I noticed
constructs for which I didn't find any doc in the latest ZopeBook (2.6
edition)

1/ <tal:block ...> elements.

2/ <metal:block ...> elements

3/ The i18n namespace.

Okay, I experienced some stuffs with these features and guessed their
respective usage, but having a doc that explain fully their usage would be
helpful.

Thanks in advance.

--Gilles