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Queries and Constraints on Semi-structured Data

  • Diego Calvanese
  • Giuseppe De Giacomo
  • Maurizio Lenzerini
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1626)

Abstract

We extend the model for semi-structured data proposed in [4], where both databases and schemas are represented as graphs, with the possibility of expressing different types of constraints on the nodes of the graphs, and defining queries which are used to select graphs from a database. We show that reasoning tasks at the basis of query optimization, such as schema subsumption, query-schema comparison, query containment, and query satisfiability, are decidable.

Keywords

Digital Library Query Language Reasoning Task Query Optimization Graph Schema 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Diego Calvanese
    • 1
  • Giuseppe De Giacomo
    • 1
  • Maurizio Lenzerini
    • 1
  1. 1.Dipartimento di Informatica e SistemisticaUniversità di Roma “La Sapienza”RomaItaly

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