Monday, March 20, 2017

Vocabulary Control

Vocabulary Control
Information Access Through The Subject

VOCABULARY CONTROL
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The term ‘vocabulary control’ refers to a limited set of terms that must be used to index documents, and to search for these documents, in a particular system. It may be defined as a list of terms showing their relationships and used to represent the specific subject of the document.


An information system may help the user by explicitly assigning index terms (that is, words or notations) to the documents and controlling, at least in the case of alphabetical (word) systems, the  semantic and often the syntatic relationships between these index terms the words (which may be subject  headings or descriptors) are assigned from  recognized subject heading lists or thesauri, and the notations from recognized classification schedules, and thus use controlled vocabulary.  A controlled vocabulary is one in which there is only one term or notation in the vocabulary for any one concept. The Library of  Congress List of Subject Headings is an example of a controlled alphabetical vocabulary, and the Dewey Decimal Classification is an example of a notational vocabulary (By definition, all notational vocabularies must be controlled).


The controlled vocabulary performs several tasks:
  • It usually explicitly records the hierarchical and affinitive/associative relations of a concept. Examples: Allergy, narrower-term: Hay fever; 385 (Railroad transportation), 381.1 (economic aspects of railroad transportation)
  • It establishes the size and scope of each topic. For example, whether or not the word baseball or the notation 796.357 is to include the concept softball.
In addition, for word based systems, the controlled vocabulary identifies synonyms terms and selects one preferred term among them. For homonyms, it explicitly identifies the multiple concepts expressed by that word or phrase. In short, vocabulary control helps in overcoming problems that occur due to natural language of the document’s subject. Hence, if vocabulary control is not exercised different indexers or the same indexer might use different terms for the same concept on different occasions for indexing the documents dealing with the same subject and also use a different set of terms for representing the same subject at the time of searching. This, in turn, would result in ‘mis-match’ and thus affect information retrieval.


Contents



Vocabulary Control
  • Subject Heading List
    • List of Subject Headings-General Principles
  • Thesaurus
    • Structure of Thesaurus
    • Relationship Between Terms
    • Thesauri and Subject Headings List
    • Thesauri and Classification Schemes
    • Thesauro-Facet
    • Classaurus
  • Systematic Arrangement




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Tuesday, March 14, 2017

Problems of Natural Language in Indexing

Information Access Through The Subject

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A new article in the Librarianship Studies & Information Technology blog provides an exhaustive description of Problems of Natural Language in Indexing.

Derived indexing is based on the natural language of the documents which proves to be problematic sometimes in the Subject Indexing Process. These problems prompted to move towards the use of Assigned indexing. These problems  can be categorized under two heads:
  1. Problems inherent in the language
  2. Problems pertaining to relationships
… … …


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Saturday, March 04, 2017

Indexing Languages

Information Access Through The Subject

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A new article in the Librarianship Studies & Information Technology blog provides an exhaustive description of Indexing Languages.

A system for naming subjects in the way that we have described is called an indexing language, and, like any other language, it will consist of two parts: vocabulary and syntax.

Indexing language is a set of items (vocabulary) and devices for handling the relationships between them in a system for providing index descriptions. Indexing language is also referred to as retrieval language … … … 


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RDA Cataloging News and RDA Bibliography

RDA Cataloging News and RDA Bibliography

New RDA Toolkit Design + Implementation of the LRM in RDA + RDA Toolkit Update, February 14, 2017
https://resourcedescriptionandaccess.blogspot.com/2016/05/rda-cataloging-news.html
#RDA #RDATOOLKIT #RDABLOG #LRM #LIBRARIANSHIPSTUDIES

RDA Cataloging News and RDA Bibliography article of Resource Description & Access (RDA) or RDA Blog blog is updated with new updates providing details of the new RDA Toolkit design and Implementation of the LRM in RDA

RDA Toolkit website has got a new elegant design:
At the top, there are 7 main links/menus, viz., HOME, SUBSCRIBE, NEWS & INFORMATION, TRAINING RESOURCES, RDA IN TRANSLATION, SHOP RDA, and MORE RESOURCES. The HOME refers to the RDA Toolkit home page. SUBSCRIBE menu has submenus: Pricing, New Subscriber, Renew, Authorized Distributors, Consortia, and Purchase Offline. NEWS & INFORMATION follows which is like a blog with new updates on RDA  … … ...

Implementation of the LRM in RDA:
The RDA Steering Committee (RSC) agreed at its November 2016 meeting to adopt the draft IFLA Library Reference Model (LRM) as a conceptual model for the development of RDA: Resource Description and Access, replacing the Functional Requirements family of models (FRBR, FRAD, and FRSAD) that are superseded by the LRM … …

RDA Toolkit Update, February 14, 2017:
A new release of the RDA Toolkit is published on Tuesday, February 14. This release contains a small number of Fast Track changes made through the normal Fast Track process … … ...
Read full update on RDA Blog: https://resourcedescriptionandaccess.blogspot.com/2016/05/rda-cataloging-news.html

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