Faceted classification

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A faceted classification is a classification scheme used in organizing knowledge into a systematic order. A faceted classification uses semantic categories, either general or subject-specific, that are combined to create the full classification entry. Many library classification systems use a combination of a fixed, enumerative taxonomy of concepts with subordinate facets that further refine the topic.

Contents

Definition

There are two primary types of classification used for information organization: enumerative and faceted. An enumerative classification contains a full set of entries for all concepts. [1] A faceted classification system uses a set of semantically cohesive categories that are combined as needed to create an expression of a concept. In this way, the faceted classification is not limited to already defined concepts. While this makes the classification quite flexible, it also makes the resulting expression of topics complex. [2] To the extent possible, facets represent "clearly defined, mutually exclusive, and collectively exhaustive aspects of a subject. The premise is that any subject or class can be analyzed into its component parts (i.e., its aspects, properties, or characteristics)." [3] Some commonly used general-purpose facets are time, place, and form. [4]

There are few purely faceted classifications; the best known of these is the Colon Classification of Shiyali Ramamrita Ranganathan, a general knowledge classification for libraries. Some other faceted classifications are specific to special topics, such as the Art and Architecture Thesaurus and the faceted classification of occupational safety and health topics created by D. J. Foskett for the International Labour Organization. [5]

Many library classifications combine the enumerative and faceted classification techniques. The Dewey Decimal Classification, the Library of Congress Classification, and the Universal Decimal Classification all make use of facets at various points in their enumerated classification schedules. The allowed facets vary based on the subject area of the classification. These facets are recorded as tables that represent recurring types of subdivisions within subject areas. There are general facets that can be used wherever appropriate, such as geographic subdivisions of the topic. Other tables are applied only to specific areas of the schedules. Facets can be combined to create a complex subject statement. [4]

Daniel Joudrey and Arlene Taylor describe faceted classification using an analogy: "If one thinks of each of the faces of a cut and polished diamond as a facet of the whole, one can picture a classification notation that has small notations standing for subparts of the whole topic, which are pieced together to create a complete classification notation." [6]

Faceted classifications exhibit many of the same problems as classifications based on a hierarchy. In particular, some concepts could belong in more than one facet, so their placement in the classification may appear to be arbitrary to the classifier. It also tends to result in a complex notation because each facet must be distinguishable as recorded. [2]

Retrieval

Search in systems with faceted classification can enable a user to navigate information along multiple paths corresponding to different orderings of the facets. This contrasts with traditional taxonomies in which the hierarchy of categories is fixed and unchanging. [7] It is also possible to use facets to filter search results to more quickly find desired results.

Examples of faceted classifications

Colon classification for library materials

The Colon Classification developed by S. R. Ranganathan is an example of general faceted classification designed to be applied to all library materials. In the Colon Classification system, a book is assigned a set of values from each independent facet. [8] This facet formula uses punctuation marks and symbols placed between the facets to connect them. Colon classification was named after its use of the colon as the primary symbol in its notation. [9] [10]

Ranganathan stated that hierarchical classification schemes like the Dewey Decimal Classification (DDC) or the Library of Congress Subject Headings are too limiting and finite to use for modern classification and that many items can pertain information to more than one subject. He organized his classification scheme into 42 classes. Each class can be categorized according to particular characteristics, that he called facets. Ranganathan said that there are five fundamental categories that can be used to demonstrate the facets of a subject: personality, material, energy, space and time. He called this the PMEST formula: [11]

Universal Decimal Classification

Another example of a faceted classification scheme is the Universal Decimal Classification (UDC), a complex multilingual classification that can be used in all fields of knowledge. [12] The Universal Decimal Classification scheme was created at the end of the nineteenth century by Belgian bibliographers Paul Otlet and Henri la Fontaine. The goal of their system was to create an index that would be able to record knowledge even if it is stored in non-conventional ways including materials in notebooks and ephemera. They also wanted their index to organize material systematically instead of alphabetically. [13]

The UDC has an overall taxonomy of knowledge that is extended with a number of facets, such as language, form, place and time. Each facet has its own symbol in the notation, such as: "=" for language; "-02" for materials, "[...]" for subordinate concepts. [4]

Faceted Classification for Occupational Safety and Health

D. J. Foskett, a member of the Classification Research Group in London, developed classification of occupational safety and health materials for the library of the International Labour Organization. [5] [14] After a study of the literature in the field, he created the classification with the following facets:

Notation was solely alphabetic, with the sub-facets organized hierarchically using extended codes, such as "g Industrial equipment and processes", "ge Machines". [14]

Art and Architecture Thesaurus (AAT)

While not strictly a classification system, the AAT uses facets similar to those of Ranganathan's Colon Classification:

Comparison between faceted and single hierarchical classification

Hierarchical classification refers to the classification of objects using one single hierarchical taxonomy. Faceted classification may actually employ hierarchy in one or more of its facets, but allows for the use of more than one taxonomy to classify objects.

See also

Related Research Articles

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examines the activities carried out and tools used by people who work in places that accumulate information resources for the use of humankind, both immediately and for posterity. It discusses the processes that are in place to make resources findable, whether someone is searching for a single known item or is browsing through hundreds of resources just hoping to discover something useful. Information organization supports a myriad of information-seeking scenarios.

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The Information Coding Classification (ICC) is a classification system covering almost all extant 6500 knowledge fields. Its conceptualization goes beyond the scope of the well known library classification systems, such as Dewey Decimal Classification (DDC), Universal Decimal Classification (UDC), and Library of Congress Classification (LCC), by extending also to knowledge systems that so far have not afforded to classify literature. ICC actually presents a flexible universal ordering system for both literature and other kinds of information, set out as knowledge fields. From a methodological point of view, ICC differs from the above-mentioned systems along the following three lines:

  1. Its main classes are not based on disciplines but on nine live stages of development, so-called ontical levels.
  2. It breaks them roughly down into hierarchical steps by further nine categories which makes decimal number coding possible.
  3. The contents of a knowledge field is earmarked via a digital position scheme, which makes the first hierarchical step refer to the nine ontical levels, and the second hierarchical step refer to nine functionally ordered form categories.

References

  1. ↑ Chan, Lois Mai (2005), Library of Congress Subject Headings, Westport, Conn: Libraries Unlimited, ISBN   1591581540, OL   3311856M, 1591581540
  2. 1 2 Svenonius, Elaine (2000), The Intellectual Foundation of Information Organization , Cambridge, Mass: MIT Press, ISBN   0262194333, 0262194333
  3. ↑ Joudrey, Daniel N., Arlene G. Taylor, and David P. Miller (2015). Introduction to Cataloging and Classification. 11th ed. Santa Barbara, CA: Libraries Unlimited.
  4. 1 2 3 Chan, Lois Mai (2007). Cataloging and classification (Third ed.). The Scarecrow Press, Inc. p.  321. ISBN   978-0-8108-5944-9. 0810859440.
  5. 1 2 Coyle, Karen (1975). "A Faceted Classification for Occupational Safety and Health". Special Libraries. 66 (5–6): 256–9.
  6. ↑ Joudrey, Daniel N.; Taylor, Arlene G. (2018). The Organization of Information. Santa Barbara, CA: Libraries Unlimited.
  7. ↑ Star, S. L. (1998, Fall). "Grounded classification: grounded theory and faceted classification". [Electronic version]. Library Trends. 47.2, 218.
  8. ↑ Garfield, E. (1984, February). "A Tribute to S. R. Ranganathan, the father of Indian library science". Essays of an Information Scientist, 7, 37-44.
  9. ↑ Chan, L. M. (1994). Cataloging and classification. New York: McGraw-Hill, Inc.
  10. ↑ Ranganathan, S. R. (2007). Colon classification (6th ed.). Ess Ess Publications. ISBN   9788170004233.
  11. ↑ Ranganathan, S. R (1987). Colon classification, 7th ed. revised and edited by M.A. Gopinath. Bangalore: Sarada Ranganathan Endowment for Library Science, 1987
  12. ↑ About universal decimal classification and the udc consortium. (2006). Retrieved November 30, 2013, from http://www.udcc.org/about.htm
  13. ↑ Batty, D. (2003). Universal decimal classification. Encyclopedia of Library and Information Science.
  14. 1 2 Foskett, D. J. (1959). "Construction of a Faceted Classification for a Special Subject". Proceedings of the International Conference on Scientific Information. National Science Foundation. pp. 867–888. ISBN   0-309-57421-8.
  15. ↑ William Denton (28 March 2009). "How to Make a Faceted Classification and Put it on the Web".
  16. ↑ Sirovich, Jaimie (2011). Categories, Facets—and Browsable Facets?, from http://www.uxmatters.com/mt/archives/2011/08/categories-facetsand-browsable-facets.php
  17. ↑ Reitz, Joan M. (2004). Dictionary for library and information science. Westport, CT: Libraries Unlimited
  18. ↑ Godert, Winfried. F. (1991). Facet classification in online retrieval. International Classification, 18, 98-109
  19. ↑ Adkisson, Hiedi P. (2005). Use of faceted classification. Retrieved December 1, 2013, from http://www.webdesignpractices.com/navigation/facets.html
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