@conference {BerdaguerCunhaPachecoVisser:07a,
	title = {Coupled Schema Transformation and Data Conversion For XML and SQL},
	booktitle = {Proceedings of the 9th International Symposium on Practical Aspects of Declarative Languages - PADL},
	series = {LNCS},
	volume = {4354},
	year = {2007},
	month = {January },
	pages = {290{\textendash}304},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	address = {Nice, France},
	abstract = {<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{\textquoteright}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>
},
	attachments = {https://haslab.uminho.pt/sites/default/files/alcino/files/padl07.pdf},
	author = {Alcino Cunha and Hugo Pacheco and Pablo Berdaguer and Joost Visser},
	editor = {M. Hanus}
}