In this study, we investigated the major classification schemes proposed during the initial phase of the development of the concept of facet (from the fourth quarter of the 19th century to the first halt of the 20th century), with the aim of exploring the spread of the concept and factors that have influenced it. We considered three types of classifications: (1) classification that first used the term "facet," i.e., the Colon Classification (CC); (2) classificatios which have notation consisting of independent elements, i.e., the Universal Desimal Classification (UDC) and the Bibliographic Classification (BC); and (3) classifications which have notation consisting of a single element, i.e., the Deway Decimal Classification (DDC) and the Expansive Classification (EC). As a result, we confirmed that early editions of the DDC already featured the use of the term "facet" to refer to the totality of subclasses of a class based on characteristics. In addition, we found that with the third edition of the CC, the ambit of the original concept was expanded to include notations consisting of independent elements, synthesis, and centered headings.
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