Litwin, Witold; Mark, Leo; and Roussopoulos, Nick 1990. Home/Search Document Not in Database Summary Related Articles |
This paper is cited in the following contexts:
Query-Answering Algorithms for Information Agents - Levy, Rajaraman, Ordille (1996) (71 citations) (Correct)
....if we want to guarantee that all answers to the query are obtained. They also propose methods for pruning the space of plans that need to be considered in that case. In the database community multidatabase systems also have the goal of providing uniform access to multiple information sources [ Litwin et al. 1990 ] In these systems the correspondence between the contents of a source and the world view is more direct. As one example, in the Pegasus system [ Ahmed et al. 1991 ] every source is modeled as a class in a class hierarchy, which is disjoint from other classes. It is therefore not possible to ....
Litwin, Witold; Mark, Leo; and Roussopoulos, Nick 1990.
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