Filter objects are used to change data. The change can involve adding, changing, or removing characters, comparing the data to a table or database, or substituting a completely different piece of data. When a field object is operated on by a rule object to generate an output transaction, filter objects are most often the means of creating the new data from the old.
Filter objects can be used within rule component objects, rule objects, and production objects, working on data either before or after it has been processed by an object. Which data a filter object acts upon depends on which object contains the filter object and where the filter object is placed in that object.
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