First we describe the overall architecture of such systems, including the fundamentals of the user interface. Thereafter, its various components are discussed.
Special emphasis is paid to how the underlying information model is layered.
A characterization calculus is presented for the characterization of structured elements. The Predicator Set Model has sufficient expressive power to describe such structures elegantly. P.D. Bruza and Th. P. van der Weide. Stratified Hypermedia Structures for Information Disclosure.