Marita Thomson
These are some definitions and principles taken from S.R. Ranganathan's Prolegomena to Library Classification (2e) (1957). The terminology isn't easy to crack without some examples, but just keep in mind that he's talking about how classification schemes like the Dewey and Library of Congress systems work. They organize knowledge (in books and other things) by deciding what the book is about and then giving it a call number and putting it in order with other books. How that aboutness is decided, to what level of detail, and how the call numbers are made, is what he's discussing. He's setting out the basic rules he thinks all classification schemes should use.
Ranganathan classification definitions principles
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