By Dan Suciu (auth.), Giorgio Ghelli, Gösta Grahne (eds.)
This e-book constitutes the completely refereed post-proceedings of the eighth foreign Workshop on Database Programming Languages, DBPL 2001, held in Frascati, Italy, in September 2001.
The 18 revised complete papers awarded including an invited paper have been rigorously chosen in the course of rounds of reviewing and revision. The papers are prepared in topical sections on semistructured facts; OLAP and knowledge mining; structures, schema integration, and index concurrency; XML; spatial databases; person languages; and principles.
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Extra resources for Database Programming Languages: 8th International Workshop, DBPL 2001 Frascati, Italy, September 8–10, 2001 Revised Papers
However, the dependencies in Σ∗ have ﬁxed size and the maximum arity of a relation in the schema is 2. The upper bound follows noting that the containment mapping can be found in NP. For the lower bound, note that the proof of NP-hardness for containment of conjunctive queries in  holds even if all relations are binary. • Example. a. ∗ y2 . It is easy to see that Q1 is contained in Q2 . We show how we infer this using theorem 1. The translation to conjunctive queries yields T Q1 = T (Q1 ) and T Q2 = T (Q2 ), with T Q1 (x1 , x3 ) ← a(x1 , x2 ), b(x2 , u1 ), c(u1 , x3 ) and T Q2 (y1 , y2 ) ← ∗(y1 , v1 ), a(v1 , v2 ), ∗(v2 , y2 ).
X R1 |R2 y, . . is equivalent to Q1 ∪ Q2 where Qi ← . . , x Ri y, . .. For dependencies, we note that x R1 |R2 y is equivalent to x R1 y ∨ x R2 y after which logical equivalences bring the disjunctions out. A disjunction in the premise of the implication in a dependency is equivalent to a conjunction (a set) of dependencies. To summarize: Remark 1. By translating away the |, any (∗, , l∗ , |)-query becomes an equivalent union of (∗, , l∗ )-queries. Similarly, any (∗, , l∗ , |)-dependency becomes an equivalent set of (∗, , l∗ )-dependencies.
Grahne and A. Thomo. An optimization technique for answering regular path queries. In WebDB, 2000. 17. G. Grahne and A. Thomo. Algebraic rewritings for regular path queries. ICDT’01. 18. J. Hopcroft and J. Ullman. Introduction to automata theory, languages, and computation. Addison-Wesley, 1979. 19. Frank Neven and Thomas Schwentick. Query automata. In PODS, 1999. 20. Frank Neven and Thomas Schwentick. Expressive and eﬃcient pattern languages for tree-structured data. In PODS, 2000. 21. C. Papadimitriou.
Database Programming Languages: 8th International Workshop, DBPL 2001 Frascati, Italy, September 8–10, 2001 Revised Papers by Dan Suciu (auth.), Giorgio Ghelli, Gösta Grahne (eds.)