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Deleting a macro

An empty macro text undefines the macro (if it was already known).


  // undeclare the IB alias
  +IB:

An alias can be used everywhere a tag can be. Tags and macros are indeed that interchangable that macros can be used to overwrite existing tags. The paragraph


  +B:\I<__body__>

transforms all occurences of \B tags into \I ones.

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