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Expert
systems
Expert systems
coupling classes
Information
resource
system
Database systems
coupling classes
Database
systems
Fig. 8.10
The overview of the frame model metadata architecture
The system developer must analyze the existing expert system in order to under-
stand what information is required. Database analysis is also required to implement
the expert database system.
Step 2. Database creation within the Frame model metadata.
The system developer must develop a database for the expert system. The system
developer then converts this database description within the frame model metadata
as a static class. Again, the system developer can also add rules to the existing ex-
pert system. He/she then converts the rules into the Frame model metadata. Each
rule is represented as an active class. Each condition of a multi-condition rule is also
represented as an active class. If the condition is not a rule, it will be recognized as
a fact. Atomic attributes will be attached to this class. The existing expert system
can be coupled into the frame model metadata as coupling classes. Each attribute is
a virtual attribute in this coupling class.
Step 3. Integration of databases and expert systems within the Frame model
metadata.
Create the integrated classes within the frame model metadata by synchroniz-
ing the attributes among the coupling classes. With the integrated class in static or
active class format, we can form an EDS. The EDS can extract information from
the source ES and DBS into coupling classes, synchronize the coupling classes by
the integrated classes, and transform information into knowledge (i.e., knowledge
engineering) to meet the application requirements.
Step 4. Develop an application using the EDS.
The EDS from the previous steps is a knowledge-based system. System develop-
ers can use it to develop new applications. The input to the EDS is the source ES
and source DBS; the coupling classes and the integrated classes are temporal in the
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