Rule-based languages

Rule based programming Language is used as a way to store a manipulate knowledge to interpret information in useful way. It is often used in AI (Artificial Intelligence) applications and research. The example of rule-based system is the domain-specific expert system that used rules to make deductions or choices.

For an example, an expert system help a teacher to choose a student based on the performance of the student in exams, activities or select tactical moves to play a game.

It has four basic components:

List of rule or rule base: It is used for specific type of knowledge base.
A semantic engine, which is used for taking action based on the interaction of input and the rule base.
Third component has three phases
- Match: In this first phase, the left-hand sides of all productions are matched against the contents of working memory.
- Conflict-Resolution: In second phase the production instantiations in the conflict set is chosen for execution.
- Act: In third phase, the actions of the production selected in the conflict-resolution phase are executed.
Temporary working memory.

Here is an example of Rule-based languages

            (object-class request
         ^action)
(startup
   (strategy MEA)
   (make request ^action hello)
)
(rule hello
   (request ^action hello)
   (write | Hello, world!| (crlf))
)

Following are some of the Languages in Rule-based languages:

OPS5