Conclusion

• Query Translation Issues:

  • Batch vs. incremental post-filtering.
  • Skipping (e.g., optional) post-filtering.
    • E.g., MetaCrawler
  • User feedback of cost/hit estimation.
  • Helping users reformulate queries.

• Future Work:

  • Approximate translation.
    • Example: QUERY: Name contains Elton AND John.
    • Source only has Last Name index.
    • What is last name? Guess?
  • Non-Boolean (Vector-Space) queries.

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