Thanks for the interesting answers. In the end I'm going to stick to LaTeX.
As a matter of fact, in an Italian newsgroup "a LaTeX expert" said that the disadvantage of LaTeX was its not being a "functional typesetting language" but a macro language to work with it is necessary to put together heaps and heaps of packages often "colliding" them because of compatibility problems. Instead he advocated of a superiority of a functional language like lout... Hence my curiosity of knowing something about lout. Thanks again Vittorio
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