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Unit 14: Canons and Principles for Library Catalogue

11. In Canon of Exclusiveness, the classes in an array of classes should not be mutually exclusive. Notes
12. In Canon of Reticence, the terms used to denote the classes in a scheme of classification
should be critical.
14.5 Principles

Following are the Principles:
1. Principle of Increasing Concreteness: If two classes are such that one can be said to be more
abstract and less concrete than the other, the former should precede the latter.
2. Principle of Increasing Artificiality: If two classes are such that one can be said to be
nearer to the “thing-in-itself” or naturalness and farther from artificiality than the other,
the former should precede the other.

14.5.1 For Facet Formula

Principle of Inversion: In an analytico-synthetic classification, the implementation of the Principle
of Increasing Concreteness requires that the facets in the facet formula of a basic class should be
in the decreasing sequence of concreteness. If the scheme has rounds of facets, the facets in each
round should be in the decreasing sequence of concreteness.

14.5.2 For Helpfulness in Array

1. Principle of Increasing Quantity: If the characteristic used admits of quantitative
measurement, the sequence of the classes may be in the ascending sequence of the measure
in which the classes share the characteristic.
2. Principle of Later-in-Time: If the classes in an array have originated in different times,
they may be arranged in a parallel progressive time-sequence.
3. Principle of Later-in-Evolution: If the characteristic is of an evolutionary nature, the
sequence of the classes may be parallel to the course of evolution.
4. Principle of Spatial Continuity: If the classes of an array occur contiguously in space, they
may be arranged in a parallel spatial sequence.
5. Principle of Increasing Complexity: If the classes in an array show different degrees of
complexity, they are arranged in the sequence of increasing complexity.
6. Principle of Canonical Sequence: If the classes are traditionally referred to in a specific
sequence, although no underlying principle is discoverable, it will be convenient to confirm
to this traditional sequence.
7. Principle of Favoured Category: The classes in an array may be arranged in the sequence
of the decreasing quantity of published documents on them.
8. Principle of Alphabetical Sequence: When no other sequence of the classes in an array is
more helpful, they are arranged alphabetically by their names current in international
usage.

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