Schema mappings and data examples
Balder ten Cate, Phokion G. Kolaitis, Wang-Chiew Tan · 2013
A fundamental task in data integration and data exchange is the design of schema mappings, that is, high-level declarative specifications of the relationship between two database schemas. Several research prototypes and commercial systems have been developed to facilitate schema-mapping design; a common characteristic of these systems is that they produce a schema mapping based on attribute correspondences across schemas solicited from the user via a visual interface. This methodology, however, suffers from certain shortcomings. In the past few years, a fundamentally different methodology to designing and understanding schema mappings has emerged. This new methodology is based on the systematic use of data examples to derive, illustrate, and refine schema mappings.