Knowledge-Based System Task Two

In the second task, some rules have been written to interpret where and when a vehicle was registered given a valid registration marks. The first two characters of the marks indicate the local memory tag which identify the region and DVLA office the vehicle registered. The first rule at_England was to identify char1 for vehicle registered in England. Besides C and S, all other uppercase alphabet entered in char1 other then those invalid characters indicate that the vehicle was registered in England. If the characters C or S were entered in char1, the vehicle would be registered in either Wales or Scotland and the following eight rules were written to identify the regions and the local offices. Next, rules have been written to interpret the age identifier, that is, the third and fourth character of the registration mark. The rule mar_aug was written to identify the age identifier from 02 to 49, therefore char3 must be between 0 and 4. I have written a function get_val(Char) for converting a digit character entered into a number value. As for age identifier 50, a separate rule mar_aug_2050 was written so that char3 will not overlap with the age identifier from 51 to 59. The rule sep_feb0, sep_feb1 and sep_feb2 was written to identify the age identifier from 51 to 58, 59 and 60 to 99 respectively.