Type-based detection of XML query-update independence

  • Authors:

  • Nicole Bidoit-Tollu;Dario Colazzo;Federico Ulliana

  • Affiliations:

  • Universite Paris Sud & INRIA Saclay;Universite Paris Sud & INRIA Saclay;Universite Paris Sud & INRIA Saclay

  • Venue:
  • Proceedings of the VLDB Endowment
  • Year:
  • 2012

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Abstract

This paper presents a novel static analysis technique to detect XML query-update independence, in the presence of a schema. Rather than types, our system infers chains of types. Each chain represents a path that can be traversed on a valid document during query/update evaluation. The resulting independence analysis is precise, although it raises a challenging issue: recursive schemas may lead to inference of infinitely many chains. A sound and complete approximation technique ensuring a finite analysis in any case is presented, together with an efficient implementation performing the chain-based analysis in polynomial space and time.