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B-A-BA tal, metal, tales

TAL consists of seven different commands (highest priority first): define, condition, repeat, content, replace, attributes, and omit-tag.  Commands are attributes on HTML or XML tags, e.g. <div tal:content="article">Article goes here</div>

The expressions used in TAL are called TALES expressions.  The simplest TALES expression is a path which references a value, e.g. page/body references the body property of the page object.

METAL is a macro language commonly used with TAL & TALES.  METAL allows part of a template to be used as a macro in later parts of a template, or a separate template altogether.

 

source : http://www.owlfish.com/software/simpleTAL/tal-guide.html