The problem of exchanging data between different databases with
different schemas is an area of immense importance. Consequently
data exchange has been one of the most active research topics in
databases over the past decade. Foundational questions related to
data exchange largely revolve around three key problems: how to
build target solutions; how to answer queries over target
solutions; and how to manipulate schema mappings themselves? The
last question is also known under the name 'metadata management',
since mappings represent metadata, rather than data in the
database. In this book the authors summarize the key developments
of a decade of research. Part I introduces the problem of data
exchange via examples, both relational and XML; Part II deals with
exchanging relational data; Part III focuses on exchanging XML
data; and Part IV covers metadata management.
General
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