A Possible World Semantics for Disjunctive Databases

  title={A Possible World Semantics for Disjunctive Databases},
  author={Edward P. F. Chan},
  journal={IEEE Trans. Knowl. Data Eng.},
We investigate the fundamental problem of when a ground atom in a disjunctive database is assumed false. There are basically two diierent approaches for inferring negative information for disjunctive databases; they are Minker's Generalized Closed World Assumption (GCWA) and Ross and Topor's Disjunctive Database Rule (DDR). A problem with the GCWA is that disjunctive clauses are sometimes interpreted exclusively, even when they are intended for inclusive interpretation. On the other hand, the… CONTINUE READING

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