Knowledge-Based System Task One

After recognizing characters using neural networks, the next step was to use KBS to validate the vehicle registration marks. In this task, a rule-based program was written to determine whether or not the set of characters entered constitutes a valid vehicle registration marks. I have added on my flex code to the file GET_MARK.KSL. There were a total of fifteen rules written in this task. The first five rules were written to validate all alphabets entered must be in uppercase. For example, the rule range_char1 states that if char1 was outside the range of A to Z, a message is printed out to indicate that char1 must be entered with an uppercase alphabets. I have set a variable code to become invalid for all rules that satisfy invalid conditions. This would result printing out an error message ‘INVALID CODE’, as the last rule (error_code) in this task will fire. The rule invalid_char1 was to validate those alphabets that were not allowed in char1. This was done the same for char2, char5, char6 and char7. As for char3 and char4, they must be a number between 0 and 9. The combination of char3 and char4 must not be entered 00 or 01 because the year 2000 and 2001 are not shown in the age identifier table for the month March to August.