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packing the nodes of the tree on the disk given the access characteristics of the disk
...The work on data bases has been very much concerned with a concept called data independence
...There is a school of thought that says that says that applications in library automation and information retrieval should follow this path as well [6,7]...Nevertheless,it is worth taking seriously the trend away from user knowledge of file structures,a trend that has been stimulated considerably by attempts to construct a theory of data [8,9],which has become known as the relational model
...A second approach is the hierarchical approach
...The third approach is the network approach associated with the proposals by the Data Base Task Group of CODASYL
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