9.2.2 Exact String Comparison  'FieldComparatorExactString'

This field comparator function compares the two fields (or field lists) given to it as strings and returns the agreement weight if they are the same and the disagreement weight if they differ.

If a frequency table is given for this field comparator, the agreement weight will be calculated using the frequency of the value in the input fields that are compared, as described in Section 9.2.1.