Research in the area of Artificial Intelligence
in the 60's of the 20th Century on field of
Computer Language Processing introduced one of the
first programs that took question on the input and
provided resulting answer on the output.
There were many systems developed for this
purpose. Simmons in 1965 (Simmons, 1965) gave
example of 15 systems. They were divided into
3 groups according to the inner structure and
processing. It was list-structured, data-based,
graphic data-based, text based and inferential.
He also described the data-based question-answer
systems in the early development phase. Basis of
these programs were translation of natural language
sentences into the symbols. Processing of the
symbols used formal logic implementation.
One of the possible implementation for symbol
processing is the system with data basis. The base
was represented using the list of symbols structure.
Example of such system was SAD SAM. The acronym
stands for Sentence Appraiser and Diagrammer and
Semantic Analysing Machine. This program had simple
English language sentences on the input and it was
able to extract atomic data from it. Sentence
was analyzed and stored into it's knowledge base.
Primary usage of SAD SAM program was the language
analysis. The system was able to determine words
classes.
In 2nd half of 1960's Theory of Relational
Databases arrived. It was built on Deduction Systems
foundation. The Relational Concept enabled advance
in General Theory of Information Systems.
Previous development brought the need to repeat
the implementation of search algorithms, definition
of inner facts form and propositional calculus.
Among similar general information system was system
developed by Bryant (Bryant & Semple, 1966). His
implementation was different from others by exact
separation of algorithms for data bases management
and other parts of the system.
It was his idea to separate implementation parts
of information system in the form of stand-alone
data-base management subsystem.
