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Schema mappings • Rules used in data exchange specify mappings between schemas. • To understand the evolution of data one needs to study operations on schema mappings. • Most commonly we need to deal with two oper
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Document Date: 2009-09-13 07:54:31
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Schema mappings • Rules used in data exchange specify mappings between schemas. • To understand the evolution of data one needs to study operations on schema mappings. • Most commonly we need to deal with two oper