Search (81 results, page 2 of 5)

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Abstract

The terminological consistency of indexers working with a thesaurus as indexing aid remains low. This suggests that indexers cannot perceive easily or very clearly the meaning of each descriptor available as index term. This paper presents the background nd some of the findings of a small scale experiment designed to study the effect on interindexer terminological consistency of modifying the nature of the semantic information given with descriptors in a thesaurus. The study also provided some insights into the respective usefulness of standardized definitions and of traditional networks of hierarchical and associative relationships as means of providing essential meaning information in the thesaurus used as indexing aid

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Abstract

Effective use of syntagmatic relationships in index languages has suffered from inaccurate or incomplete characterization in both linguistics and information science. A number of 'myths' about syntagmatic relationships are debunked: the exclusivity of paradigmatic and syntagmatic relationships, linearity as a defining characteristic of syntagmatic relationships, the restriction of syntagmatic relationships to surface linguistic units, the limitation of syntagmatic relationship benefits in document retrieval to precision, and the general irrelevance of syntagmatic relationships for document retrieval. None of the mechanisms currently used with index languages is powerful enough to achieve the levels of precision and recall that the expression of conceptual syntagmatic relationships is in theory capable of. New designs for expressing these relationships in index languages will need to take into account such characteristics as their semantic nature, systematicity, generalizability and constituent nature

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Abstract

The notion of category, from Aristotle and Kant to the present time, has been used as a basic intellectual tool for the analysis of the existence and changeableness of things. Ranganathan was the first to extrapolate the concept into the Theory of Classification, placing it as an essential axis for the logical organization of knowledge and the construction of indexing languages. This paper proposes a conceptual and methodological reexamination of the notion of category from a functional and instrumental perspective, and tries to clarify the essential characters of categories in that context, and their present implications regarding the construction and evaluation of indexing languages

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Source

From classification to 'knowledge organization': Dorking revisited or 'past is prelude'. A collection of reprints to commemorate the firty year span between the Dorking Conference (First International Study Conference on Classification Research 1957) and the Sixth International Study Conference on Classification Research (London 1997). Ed.: A. Gilchrist

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Abstract

The basic elements of faceted thesauri are described, together with a review of their origins and some prominent examples. Their use in browsing and searching applications is discussed. Faceted thesauri are distinguished from faceted classification schemes, while acknowledging the close similarities. The paper concludes by comparing faceted thesauri and related knowledge organization systems to ontologies and discussing appropriate areas of use.

Content

Beitrag eines Themenheftes "Facets: a fruitful notion in many domains".

Type

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Abstract

Purpose - This paper forms part of the series "60 years of the best in information research", marking the 60th anniversary of the Journal of Documentation. It aims to review the influence of Brian Vickery's 1971 paper, "Structure and function in retrieval languages". The paper is not an update of Vickery's work, but a comment on a greatly changed environment, in which his analysis still has much validity. Design/methodology/approach - A commentary on selected literature illustrates the continuing relevance of Vickery's ideas. Findings - Generic survey and specific reference are still the main functions of retrieval languages, with minor functional additions such as relevance ranking. New structures are becoming increasingly significant, through developments such as XML. Future development in artificial intelligence hold out new prospects still. Originality/value - The paper shows the continuing relevance of "traditional" ideas of information science from the 1960s and 1970s.

Type

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Content

Intertextual semantics is a semiotics-based approach to the design of communication artefacts primarily aimed at modeling XML structured documents. SKOS (Simple Knowledge Organization System) is a specification currently under development at the W3C that allows expressing various types of controlled vocabularies in XML. In this article, we show through an example how intertextual semantics could be applied to controlled vocabularies expressed in SKOS, and argue that it could facilitate the communication of meaning among the various persons who interact with a controlled vocabulary.

Type

a

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Abstract

The use of diagrams to express relationships in classification is not new. Many classificationists have used this approach, but usually in a minor display to make a point or for part of a difficult relational situation. Ranganathan, for example, used diagrams for some of his more elusive concepts. The thesaurus in particular and subject headings in general, with direct and indirect crossreferences or equivalents, need many more diagrams than normally are included to make relationships and even semantics clear. A picture very often is worth a thousand words. Rolling has used directed graphs (arrowgraphs) to join terms as a practical method for rendering relationships between indexing terms lucid. He has succeeded very weIl in this endeavor. Four diagrams in this selection are all that one needs to explain how to employ the system; from initial listing to completed arrowgraph. The samples of his work include illustration of off-page connectors between arrowgraphs. The great advantage to using diagrams like this is that they present relations between individual terms in a format that is easy to comprehend. But of even greater value is the fact that one can use his arrowgraphs as schematics for making three-dimensional wire-and-ball models, in which the relationships may be seen even more clearly. In fact, errors or gaps in relations are much easier to find with this methodology. One also can get across the notion of the threedimensionality of classification systems with such models. Pettee's "hand reaching up and over" (q.v.) is not a figment of the imagination. While the actual hand is a wire or stick, the concept visualized is helpful in illuminating the three-dimensional figure that is latent in all systems that have cross-references or "broader," "narrower," or, especially, "related" terms. Classification schedules, being hemmed in by the dimensions of the printed page, also benefit from such physical illustrations. Rolling, an engineer by conviction, was the developer of information systems for the Cobalt Institute, the European Atomic Energy Community, and European Coal and Steel Community. He also developed and promoted computer-aided translation at the Commission of the European Communities in Luxembourg. One of his objectives has always been to increase the efficiency of mono- and multilingual thesauri for use in multinational information systems.

Source

Theory of subject analysis: a sourcebook. Ed.: L.M. Chan, et al

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Abstract

The aim of this chapter is to demonstrate that semantic issues underlie all research questions within Library and Information Science (LIS, or, as hereafter, IS) and, in particular, the subfield known as Knowledge Organization (KO). Further, it seeks to show that semantics is a field influenced by conflicting views and discusses why it is important to argue for the most fruitful one of these. Moreover, the chapter demonstrates that IS has not yet addressed semantic problems in systematic fashion and examines why the field is very fragmented and without a proper theoretical basis. The focus here is on broad interdisciplinary issues and the long-term perspective. The theoretical problems involving semantics and concepts are very complicated. Therefore, this chapter starts by considering tools developed in KO for information retrieval (IR) as basically semantic tools. In this way, it establishes a specific IS focus on the relation between KO and semantics. It is well known that thesauri consist of a selection of concepts supplemented with information about their semantic relations (such as generic relations or "associative relations"). Some words in thesauri are "preferred terms" (descriptors), whereas others are "lead-in terms." The descriptors represent concepts. The difference between "a word" and "a concept" is that different words may have the same meaning and similar words may have different meanings, whereas one concept expresses one meaning.

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Content

The paper describes current work on the generation of a thesaurus format from the schedules of the Bliss Bibliographic Classification 2nd edition (BC2). The practical problems that occur in moving from a concept based approach to a terminological approach cluster around issues of vocabulary control that are not fully addressed in a systematic structure. These difficulties can be exacerbated within domains in the humanities because large numbers of culture specific terms may need to be accommodated in any thesaurus. The ways in which these problems can be resolved within the context of a semi-automated approach to the thesaurus generation have consequences for the management of classification data in the source vocabulary. The way in which the vocabulary is marked up for the purpose of machine manipulation is described, and some of the implications for editorial policy are discussed and examples given. The value of the classification notation as a language independent representation and mapping tool should not be sacrificed in such an exercise.

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Abstract

The current standards for monolingual and multilingual thesauri are long overdue for an update. This applies to the international standards ISO 2788 and ISO 5964, as well as the corresponding national standards in several countries and the American standard ANSI/NISO Z39.19. Work is now under way in the UK and in the USA to revise and extend the standards, with particular emphasis on interoperability needs in our world of vast electronic networks. Work in the UK is starting with the British Standards, in the hope of leading on to one international standard to serve all. Some of the issues still under discussion include the treatment of facet analysis, coverage of additional types of controlled vocabulary such as classification schemes, taxonomies and ontologies, and mapping from one vocabulary to another. 1. Are thesaurus standards still needed? Since the 1960s, even before the renowned Cranfield experiments (Cleverdon et al., 1966; Cleverdon, 1967) arguments have raged over the usefulness or otherwise of controlled vocabularies. The case has never been proved definitively one way or the other. At the same time, a recognition has become widespread that no one search method can answer all retrieval requirements. In today's environment of very large networks of resources, the skilled information professional uses a range of techniques. Among these, controlled vocabularies are valued alongside others. The first international standard for monolingual thesauri was issued in 1974. In those days, the main application was for postcoordinate indexing and retrieval from document collections or bibliographic databases. For many information professionals the only practicable alternative to a thesaurus was a classification scheme. And so the thesaurus developed a strong following. After computer systems with full text search capability became widely available, however, the arguments against controlled vocabularies gained more followers. The cost of building and maintaining a thesaurus or a classification scheme was a strong disincentive. Today's databases are typically immense compared with those three decades ago. Full text searching is taken for granted, not just in discrete databases but across all the resources in an intranet or even the Internet. But intranets have brought particular frustration as users discover that despite all the computer power, they cannot find items which they know to be present an the network. So the trend against controlled vocabularies is now being reversed, as many information professionals are turning to them for help. Standards to guide them are still in demand.

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Abstract

In the continuing search for criteria for determining the form of compound headings (i.e., headings containing more than one word), many authors have attempted to deal with the problem of entry element and citation order. Among the proposed criteria are Cutter's concept of "significance," Kaiser's formula of "concrete/process," Prevost's "noun rule," and Farradane's categories of relationships*' (q.v.). One of the problems in applying the criteria has been the difficulty in determining what is "significant," particularly when two or more words in the heading all refer to concrete objects. In the following excerpt from Subject Catalogues: Headings and Structure, a widely cited book an the alphabetical subject catalog, E. J. Coates proposes the concept of "term significance," that is, "the word which evokes the clearest mental image," as the criterion for determining the entry element in a compound heading. Since a concrete object generally evokes a clearer mental image than an action or process, Coates' theory is in line with Kaiser's theory of "concrete/process" (q.v.) which Coates renamed "thing/action." For determining the citation order of component elements in a compound heading where the elements are equally "significant" (i.e., both or all evoking clear mental images), Coates proposes the use of "term relationship" as the determining factor. He has identified twenty different kinds of relationships among terms and set down the citation order for each. Another frequently encountered problem related to citation order is the determination of the entry element for a compound heading which contains a topic and a locality. Entering such headings uniformly under either the topic or the locality has proven to be infeasible in practice. Many headings of this type have the topic as the main heading, subdivided by the locality; others are entered under the locality as the main heading with the topic as the subdivision. No criteria or rules have been proposed that ensure consistency or predictability. In the following selection, Coates attempts to deal with this problem by ranking the "main areas of knowledge according to the extent to which they appear to be significantly conditioned by locality." The theory Coates expounded in his book was put into practice in compiling the British Technology Index for which Coates served as the editor from 1961 to 1977.

Source

Theory of subject analysis: a sourcebook. Ed.: L.M. Chan, et al

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Content

Enthält die Beiträge: SCHMITZ-ESSER, W.: Language of general communication and concept compatibility; RIESTHUIS, G.: Theory of compatibility of information languages; DAHLBERG, I.: The compatibility guidelines - a re-evaluation; SOERGEL, D.: Data structure and software support for integrated thesauri; MURASZKIEWICZ, M., H. RYBINSKI u. W. STRUK: Software problems of merging multilingual thesauri; CHMIELEWSKA-GORCZYCA, E.: Compatibility of indexing tools in multidatabase environment; NEGRINI, G.: Towards structural compatibility between concept systems; SCIBOR, E.: Some remarks on the establishment of concordances between a universal classification system and an interdisciplinary thesaurus; HOPPE, S.: The UMLS - a model for knowledge integration in a subject field; DEXTRE-CLARKE, S.: Integrating thesauri in the agricultural sciences; ROULIN, C.: Bringing multilingual thesauri together: a feasibility study; ZIMMERMANN, H.: Conception and application possibilities of classification concordances in an OPAC environment; SOSINSKA-KALATA, B.: The Universal Decimal Classification as an international standard for knowledge organization in bibliographic databases and library catalogues; WOZNIAK, J. u. T. GLOWACKA: KABA Subject Authority File - an example of an integrated Polish-French-English subject headings system; BABIK, W.: Terminology as a level for the compatibility of indexing languages - some remarks; STANCIKOVA, P.: International integrated database systems linked to multilingual thesauri covering the field of environment and agriculture; SAMEK, T.: Indexing languages integration and the EUROVOC Thesaurus in the Czech Republic; SIWEK, K.: Compatibility discrepancies between Polish and foreign databases; GLINSKI, W. u. M. MURASZKIEWICZ: An intelligent front-end processor for accessing information systems

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Abstract

A thesaurus is a controlled vocabulary designed to allow for effective information retrieval. It con- sists of different kinds of semantic relationships, with the aim of guiding users to the choice of the most suitable index and search terms for expressing a certain concept. The relational semantics of a thesaurus deal with methods to connect terms with related meanings and arc intended to enhance information recall capabilities. In this paper, focused on hierarchical relations, different aspects of the relational semantics of thesauri, and among them the possibility of developing richer structures, are analyzed. Thesauri are viewed as semantic tools providing, for operational purposes, the representation of the meaning of the terms. The paper stresses how theories of semantics, holding different perspectives about the nature of meaning and how it is represented, affect the design of the relational semantics of thesauri. The need for tools capable of representing the complexity of knowledge and of the semantics of terms as it occurs in the literature of their respective subject fields is advocated. It is underlined how this would contribute to improving the retrieval of information. To achieve this goal, even though in a preliminary manner, we explore the possibility of setting against the framework of thesaurus design the notions of language games and hermeneutic horizon.

Type

a

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Abstract

This paper discusses issues concerning the augmentation of thesaurus relationships, in light of new application possibilities for retrieval. We first discuss a case study that explored the retrieval potential of an augmented set of thesaurus relationships by specialising standard relationships into richer subtypes, in particular hierarchical geographical containment and the associative relationship. We then locate this work in a broader context by reviewing various attempts to build taxonomies of thesaurus relationships, and conclude by discussing the feasibility of hierarchically augmenting the core set of thesaurus relationships, particularly the associative relationship. We discuss the possibility of enriching the specification and semantics of Related Term (RT relationships), while maintaining compatibility with traditional thesauri via a limited hierarchical extension of the associative (and hierarchical) relationships. This would be facilitated by distinguishing the type of term from the (sub)type of relationship and explicitly specifying semantic categories for terms following a faceted approach. We first illustrate how hierarchical spatial relationships can be used to provide more flexible retrieval for queries incorporating place names in applications employing online gazetteers and geographical thesauri. We then employ a set of experimental scenarios to investigate key issues affecting use of the associative (RT) thesaurus relationships in semantic distance measures. Previous work has noted the potential of RTs in thesaurus search aids but also the problem of uncontrolled expansion of query term sets. Results presented in this paper suggest the potential for taking account of the hierarchical context of an RT link and specialisations of the RT relationship

Type

a