SUBCODES: AN EXAMINATION OF THEIR UTILITY WITH SPECIAL REFERENCE TO FEATURE CARD SYSTEMS

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Abstract
A number of over-lapping terms have been applied to coding techniques used in association with post-co-ordinate indexing. These include subcodes, which can be interpreted as the generic term; superimposed, graphic and random coding and Zatocoding, which are nearly synonymous; and partial or derived coding: the last named may be considered as a bridge between the second group (superimposed, etc.) and direct coding techniques. For the sake of consistency, the terms graphic coding and partial coding will be employed wherever possible. The general principles of coding have been adequately reviewed in C. P. Bourne's Methods of Information Handling and have been subjected to detailed analysis in J. L. Jolley's Data Study. Graphic codes have been studied in considerable depth in the above; therefore, a brief introduction will suffice.

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