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21
A pragmatic approach: meeting the impedance mismatch
211
A clear need, but a lack of specifications
212
The impedance mismatch
213
Abstract types versus concrete types
214
Inheritance, polymorphism, partial types
215
The use of types
216
Value and object semantics, types and classes
217
Summing up the concerns related to the query language
22
The prejudices of the initial database paradigm
221
The starting point: the RDBMS analysis
222
Ambiguities of this analysis
223
Bindings to traditional languages
23
Interpreting the mismatches
231
Object-oriented languages
232
Towards a specification: a new paradigm

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