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Theme

Klassifikationssysteme im Online-Retrieval

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Source

nfd Information - Wissenschaft und Praxis. 49(1998) H.6, S.345-351

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Abstract

This study is an attempt to assess the potential for automatic vocabulary switching from a thesaurus to LCSH. Terms from the 'Laborline Thesaurus' were manually mapped to LCSH, with the degree of match indicated by a code from 1 to 19, representing the nature of the match from exact match to no match. Am INMAGIC database for the amp was created in order to permit analysis of the aptterns of matches to see whether there were regularities that could be exploited to improve the performance of switching interfaces. Searches of the database by match codes reveal ranges of 21,98% for no matches to 0,06% for translation matches, with 16,3% for exact matches. It is estimated that a maximum of 61%, but a more realistic figure of 41,5%, of the terms coulc be successfully switched automatically using currently proposed or available strategies. As long as LCSH is used for subject descriptions in online catalogs, it would appear that intelligent interfaces for vocabulary switching can only be partially successful, and it is suggested that manual mapping, while labor-intensive, is a feasible alternative

Source

Library quarterly. 65(1995) no.1, S.39-61

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Content

RDF Data Model At the core of RDF is a model for representing named properties and their values. These properties serve both to represent attributes of resources (and in this sense correspond to usual attribute-value-pairs) and to represent relationships between resources. The RDF data model is a syntax-independent way of representing RDF statements. RDF statements that are syntactically very different could mean the same thing. This concept of equivalence in meaning is very important when performing queries, aggregation and a number of other tasks at which RDF is aimed. The equivalence is defined in a clean machine understandable way. Two pieces of RDF are equivalent if and only if their corresponding data model representations are the same. Table of contents 1. Introduction 2. RDF Data Model 3. RDF Grammar 4. Signed RDF 5. Examples 6. Appendix A: Brief Explanation of XML Namespaces