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Eduncle Best Answer
The literary warrant concept was initially formulated in 1911 by the English librarian E. Wyndham Hulme (1859-1954) who included it in his work Principles of Book Classification, published in a series of articles in the Library Association Record between 1911 and 1912.
Hulme established that "a class heading is warranted only when a literature in book form has been shown to exist, and the test of the validity of a heading is the degree of accuracy with which it describes the area of subject-matter common to the class" (Hulme 1911, 447). Considering this starting point, Chan, Richmond and Svenonius deduced that, for him, "the basis for classification is to be found in the actual published literature rather than abstract philosophical ideas or 'concepts in the universe of knowledge'" (Chan, Richmond and Svenonius 1985b, 48).