Lets records through based on whether an expression evaluated for each record is distinct.
Required: An expression that is evaluated for each record and whose value is used to determine whether the record is distinct. For example, value="${part}" means the value of the part field is used to determine whether the record is distinct, and value="${part}:{location}" means the component string is used to determine whether the record is distinct.
If distinct="true", only records where the value expression is distinct are let through. If distinct="false", only the second and subsequent records for which the value expression evaluates to the same value are let through. (Default=true)
If nolog="false", records that do not match are logged as errors. If nolog="true", non-matches are not logged as errors. (Default=false)