From what I understand of HTML::Mason, I think it does most/all of what you need. Apart from the tags, what about it doesn't work for you?

Additional Modules, which I am supposed to package, additionally, to my own stuff. Make sure they work on the target system. Dependecies beyond the perl core.
It seems overkill to write yet another template system just because you prefer <!-- --> to <% %>.
Embedding all my alterations into the source files as standard W3C compliant comments is essential to cross-work with the designers. And, again, it's not a system, it's about dealing with templates only with the perl core modules.

greetings,
--shmem

In reply to Re^2: RFC: Templating without a System by shmem
in thread RFC: Templating without a System by shmem

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