publications:
- title: "Coupled Schema Transformation and Data Conversion for XML and SQL"
  author:
  - name: "Pablo Berdaguer"
    link: "http://wiki.di.uminho.pt/twiki/bin/view/Personal/Pablo/WebHome"
  - name: "Alcino Cunha"
    link: "http://www.di.uminho.pt/~mac/"
  - name: "Hugo Pacheco"
    link: "http://alfa.di.uminho.pt/~hpacheco/"
  - name: "Joost Visser"
    link: "http://www.di.uminho.pt/~joost.visser/"
  year: "2007"
  doi: "http://dx.doi.org/10.1007/978-3-540-69611-7_19"
  abstract: "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."
  links:
    doi: "http://dx.doi.org/10.1007/978-3-540-69611-7_19"
  tags:
  - "rule-based"
  - "Data refinement"
  - "data-flow language"
  - "relational database"
  - "graph transformation"
  - "XML"
  - "XML Schema"
  - "refinement"
  - "SQL"
  - "transformation language"
  - "coupled evolution"
  - "coupled transformation"
  - "constraints"
  - "Haskell"
  - "type system"
  - "data-flow"
  - "Schema transformation"
  - "format evolution"
  - "graph-rewriting"
  - "rules"
  - "migration"
  - "transformation system"
  - "Two-level transformation"
  - "2LT"
  - "rewriting"
  - "transformation"
  researchr: "https://researchr.org/publication/BerdaguerCPV07"
  cites: 0
  citedby: 0
  pages: "290-304"
  booktitle: "PADL"
  kind: "inproceedings"
  key: "BerdaguerCPV07"