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Author: Serge Baile
Publisher:
ISBN:
Category :
Languages : fr
Pages : 15
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Author: Serge Baile
Publisher:
ISBN:
Category :
Languages : fr
Pages : 15
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Book Description
Author: Jeanne Dancette
Publisher: PUM
ISBN: 2760617769
Category : Business & Economics
Languages : en
Pages : 376
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Author: Serge Baile
Publisher:
ISBN:
Category :
Languages : fr
Pages : 28
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Author: Amelia H. Boss
Publisher:
ISBN:
Category : Adhesion contracts
Languages : en
Pages : 270
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Book Description
Author: Marcelo Arenas
Publisher: Springer Nature
ISBN: 3031018400
Category : Computers
Languages : en
Pages : 101
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Book Description
Data exchange is the problem of finding an instance of a target schema, given an instance of a source schema and a specification of the relationship between the source and the target. Such a target instance should correctly represent information from the source instance under the constraints imposed by the target schema, and it should allow one to evaluate queries on the target instance in a way that is semantically consistent with the source data. Data exchange is an old problem that re-emerged as an active research topic recently, due to the increased need for exchange of data in various formats, often in e-business applications. In this lecture, we give an overview of the basic concepts of data exchange in both relational and XML contexts. We give examples of data exchange problems, and we introduce the main tasks that need to addressed. We then discuss relational data exchange, concentrating on issues such as relational schema mappings, materializing target instances (including canonical solutions and cores), query answering, and query rewriting. After that, we discuss metadata management, i.e., handling schema mappings themselves. We pay particular attention to operations on schema mappings, such as composition and inverse. Finally, we describe both data exchange and metadata management in the context of XML. We use mappings based on transforming tree patterns, and we show that they lead to a host of new problems that did not arise in the relational case, but they need to be addressed for XML. These include consistency issues for mappings and schemas, as well as imposing tighter restrictions on mappings and queries to achieve tractable query answering in data exchange. Table of Contents: Overview / Relational Mappings and Data Exchange / Metadata Management / XML Mappings and Data Exchange
Author:
Publisher: Hermes Science Publications
ISBN: 9782866012847
Category : Electronic data interchange
Languages : fr
Pages : 148
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Author: Jean-Philippe Genêt
Publisher:
ISBN:
Category : Data bases
Languages : en
Pages : 388
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Book Description
Author: J. L. Messia
Publisher: Martinus Nijhoff Publishers
ISBN: 9780792319597
Category : Political Science
Languages : en
Pages : 1272
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Book Description
The "European Yearbook" promotes the scientific study of European organisations and the Organisation for Economic Co-operation and Development. Each volume contains a detailed survey of the history, structure and yearly activities of each organisation and an up-to-date chart providing a clear overview of the member states of each organisation. In addition, a number of articles on topics of general interest are included in each volume. A general index by subject and name, and a cumulative index of all the articles which have appeared in the "Yearbook," are included in every volume and provide direct access to the "Yearbook's" subject matter. Each volume contains a comprehensive bibliography covering the year's relevant publications. This is an indispensable work of reference for anyone dealing with the European institutions.
Author:
Publisher: Food & Agriculture Org.
ISBN: 9251373914
Category :
Languages : en
Pages : 148
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Author: Management Accountancy Computer Education (Firm)
Publisher:
ISBN: 9781874691303
Category : Business
Languages : en
Pages : 114
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