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## METAL namespace

URI for this namespace is `http://xml.zope.org/namespaces/metal`. To use `metal:` attribute prefix in XML you're required to declare it:

              <html xmlns:metal="http://xml.zope.org/namespaces/metal" …>

#### Note

PHPTAL does not enforce this requirement.

METAL stands for 'Macro Extension for TAL'. This namespace allows template designers to define and call macros. Macros can be used to output data recursively or to include code from other template files.

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