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LaTeX is based on the idea that ''authors'' should be able to concentrate on ''writing'' within the logical structure of their document, rather than spending their time on the details of ''formatting''.
It encourages the separation of layout from content, whilst still allowing manual typesetting adjustments where needed.
Because the author specifies the logical structure of the document, and lets the LaTeX system worry about the presentation, it is often regarded as superior to [[word processor]]s and most other desktop publishing systems, which allow trivially easy visual layout changes but tend to intertwine content and form so tightly that consistency and automation are often difficult. LaTeX also provides great flexibility in formatting while maintaining the identity of structure, which purely structural systems like [[SGML]] and [[XML]] do not directldirectly address.
 
LaTeX can be arbitrarily extended by using the underlying [[macro language]] for developing custom formats.