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- W4254308099 abstract "This chapter presents an annotation management system for relational databases. In this system, every piece of data in a relation is assumed to have zero or more annotations associated with it and annotations are propagated along, from the source to the output, as data is being transformed through a query. Such an annotation management system is important for understanding the provenance and quality of data, especially in applications that deal with integration of scientific and biological data. The chapter presents an extension, pSQL, of a fragment of SQL that has three different types of annotation propagation schemes, each useful for different purposes. The default scheme propagates annotations according to where data is copied from. The default-all scheme propagates annotations according to where data is copied from among all equivalent formulations of a given query. The custom scheme allows a user to specify how annotations should propagate. The chapter presents a storage scheme for the annotations, and discusses the algorithms for translating a pSQL query. For the default-all scheme, the chapter presents how one can generate many queries finitely that can simulate the annotation propagation behavior of the set of all equivalent queries, which is possibly infinite. The algorithms are implemented and the feasibility of the system is demonstrated by a set of investigations conducted." @default.
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- W4254308099 date "2004-01-01" @default.
- W4254308099 modified "2023-09-24" @default.
- W4254308099 title "An Annotation Management System for Relational Databases" @default.
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- W4254308099 doi "https://doi.org/10.1016/b978-012088469-8.50079-6" @default.
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