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Electronic Edition @ Ceur-ws.org (open Access).pdf

paper_9.pdf
Preview of electronic edition @ ceur-ws.org (open access)
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Summary

The Deep Web consists of data accessible through web pages but not indexable by search engines, and is typically represented as relational tables with access limitations. This paper proposes a conceptual framework for answering keyword queries on Deep Web sources, formalizing the notion of optimal answer and characterizing queries for which an answer can be found. The authors model data sources as relations with input and output attributes, and introduce the concept of access limitations, where data can only be queried according to given patterns. They propose a semantics of optimal answer to a keyword query and tackle the problem of finding an answer by assuming known domains of the keywords, allowing for static analysis to discard irrelevant cases. The approach makes use of the schema of the data sources but relies on building a minimal query plan of accesses to the data sources, rather than traditional schema-based or schema-free approaches.

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The Deep Web consists of data accessible through web pages but not indexable by search engines, and is typically represented as relational tables with access...

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  • File Format: PDF
  • File Size: 366 KB
  • Pages: 8
  • Language: EN
  • Total Downloads: 78
  • Last Updated: 10 hours ago

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