In earlier version I was able to add one or more characters to an attribute
of an HTML element to save it for potentional future use during development.
E.g., <a _tal:content="">xyz</a>, but this fails now with PHPTAL 1.2.1 with
the error of "There is no namespace declared for prefix of attribute
_tal:content of element < a >". In my opinion, PHPTAL shouldn't throw an
exception when it encounters an attribute that it doesn't recognize. It
should ignore it. A convinient ability is now gone.
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