Tracing Data Transformations: A Preliminary Report.

We study a novel problem: tracing data transformations. That is, for a particular target data type, e.g., obtained from the output schema, we trace over the transformation specifications and extract from them the fragments that are exactly used to compute instance data of the type. Our work provides a piecemeal fashion to understand a transformation semantic, and hence would be useful for users to test, debug, and refine the transformation specifications. [ABSTRACT FROM AUTHOR]