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Discuss how the bi-directional Implementations are made.
In bi-directional implementation of the association, a pair of references must implement every link. The declarations and code essential to support such implementations are same as required in unidirectional implementation. The single difference is that suitable fields have to be declared in both the classes participating in an association.
1. Which model is used to store data in tree structures Ans: Hierarchical model is used to store data in tree structures
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basic structure of xml
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