<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Alcino Cunha</style></author><author><style face="normal" font="default" size="100%">Hugo Pacheco</style></author><author><style face="normal" font="default" size="100%">Pablo Berdaguer</style></author><author><style face="normal" font="default" size="100%">Joost Visser</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">M. Hanus</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Coupled Schema Transformation and Data Conversion For XML and SQL</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of the 9th International Symposium on Practical Aspects of Declarative Languages - PADL</style></secondary-title><tertiary-title><style face="normal" font="default" size="100%">LNCS</style></tertiary-title></titles><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">January </style></date></pub-dates></dates><urls><related-urls><url><style face="normal" font="default" size="100%">https://haslab.uminho.pt/sites/default/files/alcino/files/padl07.pdf</style></url></related-urls></urls><publisher><style face="normal" font="default" size="100%">Springer-Verlag</style></publisher><pub-location><style face="normal" font="default" size="100%">Nice, France</style></pub-location><volume><style face="normal" font="default" size="100%">4354</style></volume><pages><style face="normal" font="default" size="100%">290–304</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;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.&lt;/p&gt;
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