PART 1 : What is a thesaurus ? Concept and samples
[Pages:75]PART 1 : What is a thesaurus ? Concept and samples
Christine Laaboudi-Spoiden Publications Office of the European Communities
EUR-LEX Unit ? Documentary section
Cape Town, June 2006
EUR-Lex ? Searching information
EUR-LEX
direct free access to European Union law
? the treaties, legislation, case-law and legislative proposals
? Official Journal of the European Union ? Official Journal L ? Legislation ? Official Journal C ? Information and notices ? Official Journal ? Special editions ? European Court Reports ? Documents of the institutions ? Consolidated texts
Cape Town, June 2006
EUR-Lex : Searching information
COMPUTER CRIME
? Title and text: computer crime 40 Hits
COMPUTER RELATED CRIME
? Title and text: computer crime 58 Hits
CYBERCRIME
? Title and text: cybercrime 55 Hits
CYBER CRIME
? Title and text: cyber crime 48 Hits
COMPUTER CRIME, CYBERCRIME, CYBER CRIME (Boolean - OR)
? Title and text: computer crime, cybercrime 129
Hits
USE OF SYNONYMS OR EQUIVALENT TERMS
Cape Town, June 2006
EUR-Lex sample ?Bibliographic Notice
TERMEESUDR'OINVDOEXCATDIOENSCouRDIPESTCORRIPSTEURS INDEXING TERMS PREFERRED TERMS CLASSIFICATION SCHEME SUBJECT HEADINGS
Cape Town, June 2006
Indexing process
Indexing = Identify the concept
Represented in a document
EUROVOC descriptor: information society, computer crime, personal data, electronic mail, confidentiality
For information retrieval (information request)
Title and text: computer crime, cybercrime 129 Hits
Content Indexing = only 1 process ! Searching = start again if the results are not
relevant to the question.
Cape Town, June 2006
Search Results
Relevant / Relevancy = relationship between a document and a request.
? The document is relevant to the topic ? It replies to the user's request
Pertinence = relationship between a document and an information need.
? Relevant and useful for a user ? Relevant but the user doesn't find it useful
(language, level of comprehensibility, type)
Irrelevant results = NOISE Non-retrieved results = SILENCE
Cape Town, June 2006
Causes of searching failures
Two words don't mean exactly the same thing Enormous range of choices of words and expressions No true synonyms, although words are often close in
meaning Words are not clearly understood Inconsistent use of words Users are unlikely to choose all the relevant terms The user might choose the terms used by the indexer
with a different understanding of meaning.
Cape Town, June 2006
Need of a controlled vocabulary
A controlled vocabulary = A consistent set of words/expressions, along with rules of usage, to be followed when indexing / searching
Nature of indexing language
A list of terms acceptable to users Mechanisms for structuring and using those terms Minimize the ambiguity of isolated vocabulary that
may be out of context
Cape Town, June 2006
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