Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Constraint-based XML query rewriting for data integration
SIGMOD '04 Proceedings of the 2004 ACM SIGMOD international conference on Management of data
Twiglist: make twig pattern matching fast
DASFAA'07 Proceedings of the 12th international conference on Database systems for advanced applications
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We study the problem of answering XML queries over multiple data sources under a schema-independent scenario where XML schemas and schema mappings are unavailable. We develop the fragment join operator -- a general operator that merges two XML fragments based on their overlapping components. We formally define the operator and propose an efficient algorithm for implementing it. We define schema-independent query processing over multiple data sources and propose a novel framework to solve this problem. We provide theoretical analysis and experimental results that show that our approaches are both effective and efficient.