The author of this report has been charged by the UDC Consortium to study the possibility of a revision of class 1 Philosophy. Psychology, of the Universal Decimal Classification. In order to explore the situation and discuss possibilities of revising Class 1, an informal working group was formed at the beginning of 2009 by the author of this report. Members of the working group agreed that the revised class should have a fully faceted structure. One basic step in the revision study is to identify the facets needed to express the contents of philosophical knowledge appropriately. To this purpose, one starting point was provided by examination of the facets of philosophy in existing classifications, in particular BC2. The next steps will be to pay more attention to the details of classes and subclasses, and to the update of terminology and presentation of the schedule. All these components are expected to be included in a final proposal for revision of class 1.

The BBC Archive is one of the world’s largest multimedia archives, held in 27 locations across the UK. The Archive contains over 2 million items of TV and video, 300,000 hours of audio, 6 million still photographs, over 4 million items of sheet music, and over half-a-million documents and records. It is a working media library, fulfilling some 4,000 loans per week, as well as preserving content as part of the UK’s national cultural heritage. A team of cataloguers and media managers classify a selection of current content, as well as enhancing cataloguing and classification of legacy content. There are two major classification schemes used in the Archive, both numerical, and one based on UDC. Lonclass, based on UDC, was developed first, then Telclass, which is used by the Natural History Unit in Bristol. In addition, there are many and various controlled vocabularies that have been developed to tag content in the different nations (Scotland, Wales, and Northern Ireland) and the English regions.

The importance of languages in the UDC is consistent with the significance of linguistic facets for knowledge organization in general. Languages are the main facet category implicated in processes as crucial as the development of the Linguistics class, the organization of national and regional literatures, the categorization of human ancestries, ethnic groupings and nationalities, and the description of the language in which a document is written. Language numbers are extensively used across the entire UDC scheme, and form the basis for a faceted approach in class structuring and number building. For this reason, Common Auxiliaries of Languages (Table 1c) deserve special attention. Upon the completion of the revision of American indigenous languages (2007-2008), it was evident that other language families would benefit from the same careful examination. The next class we are looking to improve is =4, Afro-Asiatic, Nilo-Saharan, Congo-Kordofanian, Khoisan languages. Thus, in 2009 the author has started a research into indigenous languages of Africa. In this paper, the initial research findings for the improvement of the class =4 are presented.

The paper describes a problem particular to universal knowledge classifications with a disciplinary structure. These types of classification present concepts subsumed to the disciplines in which they are studied and thus have to resolve the problem of concepts being repeated in different fields of knowledge. The author looks into how the impact the repetition of concepts in the UDC disciplinary structure may have on information retrieval. He considers advantages and disadvantages of different approaches in presenting re-used concepts in the scheme.

This text is a brief update on the progress of the revision of biological systematics in UDC that has not had an overall revision for many decades. The first stage of the project, in 2010, included the revision of the taxonomy of vertebrates, and this was completed and published in Extensions and Corrections to the UDC - E&C, 32 (2010). The next stage, completed in 2011, was class 582 Systematic botany, published as the revised table in this issue - E&C, 33 (2011). In this paper, the author of the revised tables provides a brief overview of content organization and presentation in the new schedules and specific information about the revision of Botany.

The author explains some general principles in structuring classifications, in particular the facet as a basic building element of the scheme. The paper provides an overview of structural and presentational elements of facets and how these can be expressed through notational system. The author also analyses the way some broad fundamental facets of concepts are presented in UDC tables, when these are represented by special auxiliaries, and proposes a way of normalising facet presentation so that it becomes consistent and easy to recognize in UDC.

Report on the 2011 International UDC Seminar, "Classification and Ontology: Formal Approaches and Access to Knowledge", which took place on 19-20 September 2011 in the National Library of the Netherlands (The Hague).

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