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CAS supports field prompting: if the data to be validated contains a question mark (?), then CAS displays a list of all valid values for the field, with a description of each. The data can contain just part of the value, followed by a question mark; this displays all valid values that generically match the supplied value.
When you use the CAS API to validate data against a table this facility is provided by CAS with no additional code required on your part. This facility can be turned off through a parameter to the API (for instance, when you want a question mark to be valid input).
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