Discussion
Emptying digit is used in colon classification to provide ...............
Answer: B
The emptying digit provides hospitality in array.
An array is a set of coordinate classes at one level of a scheme. With single digits an array would soon run out of places. Ranganathan's emptying digit is a digit that, coming after another digit, empties it of its ordinal value, so further digits can be added at the same level and new coordinate classes interpolated. It is one of his devices for hospitality in array, with the octave and gap devices.
Hospitality in chain, extending a class downward into subdivisions, comes from decimal fraction notation and the use of facets, not from the emptying digit. 'Hospitality in notation' is not the established term, and 'broken order' names no notational device.
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