%0 Conference Paper
%B Proceedings of the 9th International Symposium on Practical Aspects of Declarative Languages - PADL
%D 2007
%T Coupled Schema Transformation and Data Conversion For XML and SQL
%A Alcino Cunha
%A Hugo Pacheco
%A Pablo Berdaguer
%A Joost Visser
%E M. Hanus
%C Nice, France
%I Springer-Verlag
%P 290–304
%S LNCS
%V 4354
%X <p>A two-level data transformation consists of a type-level transformation of a data format coupled with value-level transformations of data instances corresponding to that format. We have implemented a system for performing two-level transformations on XML schemas and their corresponding documents, and on SQL schemas and the databases that they describe. The core of the system consists of a combinator library for composing type-changing rewrite rules that preserve structural information and referential constraints. We discuss the implementation of the system’s core library, and of its SQL and XML front-ends in the functional language Haskell. We show how the system can be used to tackle various two-level transformation scenarios, such as XML schema evolution coupled with document migration, and hierarchical-relational data mappings that convert between XML documents and SQL databases.</p>
%8 January
%> https://haslab.uminho.pt/sites/default/files/alcino/files/padl07.pdf