The concept of canon is very broad; in a general sense it refers to being a rule or a body of rules. There are definitions that state it as: “the body of rules, principles, or standards accepted as axiomatic and universally binding in a field of study or art”. This can be related to such topics as literary canons or the canons of rhetoric, which is a topic within itself that describes the rules of giving a speech. There are five key principles, and when grouped together, are the principles set for giving speeches as seen with regard to Rhetoric. This is one such example of how the term canon is used in regard to rhetoric.
^W.C Sayers (1915–1916) established a system of canons of classification Sayers, W.C. (1915-1916). Canons of classification applied to "The subject", "The expansive", "The decimal" and "The Library of Congress" classifications: A study in bibliographical classification method. Lindon: Grafton.
^S. R. Ranganathan developed a theory of facet analysis which he presented as a detailed series of 46 canons, 13 postulates and 22 principles. in Prolegomena to library classification. New York: Asia Publishing House. Spiteri, Louise (1998). A Simplified Model for Facet Analysis: Ranganathan 101. Canadian Journal of Information and Library Science—Revue Canadienne des Sciences de l'Information et de Bibliotheconomie, 23(1-2), 1-30., Retrieved from: http://iainstitute.org/en/learn/research/a_simplified_model_for_facet_analysis.php
^Toye, Richard (2013). Rhetoric A Very Short Introduction. Oxford, United Kingdom: Oxford University Press. ISBN978-0-19-965136-8.
^"Canon". Dictionary.com. Random House, Inc. Retrieved September 29, 2014.