1. A method, including: receiving a rule having at least one rule case for producing an output value based on one or more input values, generating a transform for receiving data from an input dataset and transforming the data based on the rule including producing a first series of values for at least one output variable in an output dataset, at least one value in the first series of values including a second series of values, and providing an output field corresponding to the at least one output variable in the output dataset for storing the second series of values.