A study on information media symmetry based on data types

The symmetry that exists between the history of information media that have been used for human communication and the history of information media that have been augmented by the expansion of computer application areas is discussed. The former reflects the inductive thinking of humans, while the latter corresponds to the deductive processing of computers. ´Type´ is the goal of the generic concepts that have been generated in the process of information abstraction in the induction process - that is to say, the process of metamodeling. It is also possible to think that the ´types´ in program languages, CORBA IDL, and XML schema are their application to computer systems, network systems and document systems respectively.