Schema Change Operations for Full Support of Schema Versioning in the τXSchema Framework

Zouhaier Brahmia, Fabio Grandi, Barbara Oliboni and Rafik Bouaziz
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Zouhaier Brahmia: University of Sfax, Sfax, Tunisia
Fabio Grandi: University of Bologna, Bologna, Italy
Barbara Oliboni: University of Verona, Verona, Italy
Rafik Bouaziz: University of Sfax, Sfax, Tunisia

International Journal of Information Technology and Web Engineering (IJITWE), 2014, vol. 9, issue 2, 20-46

Abstract: tXSchema (Currim et al., 2004) is a framework (a language and a suite of tools) for the creation and validation of time-varying XML documents. A tXSchema schema is composed of a conventional XML Schema annotated with physical and logical annotations. All components of a tXSchema schema can evolve over time to reflect changes in the real-world. Since many applications need to keep track of both data and schema evolution, schema versioning has been long advocated to be the best solution to do this. In this paper, we complete the tXSchema framework, which is predisposed from the origin to support schema versioning, with the definition of the operations which are necessary to exploit such feature and make schema versioning functionalities available to final users. Moreover, we propose a new technique for schema versioning in tXSchema, allowing a complete and safe management of schema changes. It supports both versioning of conventional schema and versioning of annotations, in an integrated manner. For each component of a tXSchema schema, our approach provides a complete and sound set of change primitives and a set of high-level change operations, for the maintenance of such a component and defines their operational semantics.

Date: 2014
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