The catalog: a flexible data structure for magnetic tape [by] Martin Kay and Theodore Ziehe.

by Martin Kay, Theodore W. Ziehe


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An outline of a generalized storage sscheme for large files of highly structured data (or catalogs) and a description of their realization on magnetic tape. Each datum, large or small, is assigned to one of a number of data classes of which a user may define any number. The over-all organization of a catalog is given by a map that imposes a tree structure on the set of data classes. Catalogs may participate as individual data in other catalogs so that the structure of a file may be recursive. A flexible addressing scheme not only facilitates the retrieval of data and sets of data in response to easily formulated requests but also provides a basis for updating catalogs. General procedures called transformations can be used to derive catalogs with new structures from existing catalogs.

This report is part of the RAND Corporation Research memorandum series. The Research Memorandum was a product of the RAND Corporation from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

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