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Introduction: Faceted classification appears to be of utmost importance. Ersatz facets, resource faceting and tag faceting: The distinctions are drawn between facets and ersatz facets, and between faceted resources and faceted tags. Single tag resource faceting and multiple tag information object faceting: The basic features are explored of single tag tagging of physical resources and multiple tag tagging of information entities. Kaiser: Jerome Kaiser's work is identified as exemplifying a faceted theory but yet one that goes beyond ersatz faceting. Aspects: Considerations of "aspects" are used to extend faceting yet further. More general faceting: Ideas are offered on general faceting and its properties. Conclusions: Faceted classification can be developed considerably further than it has been thus far. [This paper was published as part of: Proceedings of the Eighth International Conference on Conceptions of Library and Information Science, Copenhagen, Denmark, 19-22 August, 2013.]

A description is provided of basic faceted classification, which involves combinations of foci across facets, where the foci within a facet are dependent (i.e., exclusive) and the foci across facets are independent (i.e., orthogonal). This is shown to be suitable for organizing the basic goods that Amazon, the online retailer, sells and for progressive filtering as a mode of search. However, on closer inspection, the Amazon case involves a sorted domain. This is problematic for basic faceted classification. Additionally, books from Amazon would typically carry subject classification, which also is difficult for basic faceted classification. It does not support filtering as a mode of search. Subject classification really requires relatively sophisticated linguistic and logical constructors and modifiers, such as adjectives, adverbs, functions, binary relations, and transitive verbs. These can be part of a synthetic subject classification scheme, but they pose a challenge for faceting. [ABSTRACT FROM AUTHOR]

Logical division is a process which takes a class and creates a tree of classes from some subclasses of the class. The resulting tree of classes can be used for classification. The tree has a "root," a summum genus, which is the original class, and "leaves," infima species. The classification structure created by division has some admirable properties; any item to be classified has its own unique place in a leaf class and inherits attributes from the unique branch going from that leaf to the root. The structure embodies the maximum amount of general attribute information about the items being classified. Such classification structures have proved viable and useful both for classification of non-animate natural kinds and for classification of artificial kinds. Classification structures created by logical division seem unsuitable for living organisms. This is largely because classification of living organisms seems to require attention to ancestry and common ancestry and not just to shared characteristics. Logical division sheds no light on ancestry. [ABSTRACT FROM AUTHOR]