collaborative editing

[Michele Simionato]

Suppose I want to write a book with many authors via the Web. The book has 
a hierarchical structure with chapter, sections, subsections, subsubsections, 
etc. At each moment it must be possible to print the current version of the 
book in PDF format. There must be automatic generation of the table of contents,
indices, etc. Conversions to many formats (Latex, DocBook, etc.) would be
welcome. Does something like that already exists? Alternatively, I would need
some hierarchical Wiki with the ability of printing its contents in an
structured way. 


            Michele Simionato