Subject access to opac, Other Management

Subject Access to OPAC 

The typical OPAC interaction process requires the matching or crude translation of user vocabulary to system vocabulary. It became apparent that the amount of subject information included in standard MARC records is not adequate to meet the users' subject approach to the OPAC. Online capabilities offer many possibilities for improved subject access. Two important search devices used in OPACs are discussed below: 

Boolean Search 

Boolean search is the process of searching where the search terms are combined through Boolean Operators (AND, OR, NOT) 

Logical Product AND' Here two or more terms are combined by logical "AND" in order to formulate the search statement. If we formulate the search statement as A and B, we require that matching for both A and B in the index record to take place. Thus, a search for 'Electronic Scanner' seeks to formulate the search statement as 'Electronic AND Scanner'. 

Logical Sum 'OR':  Here two or more terms are  combined by logical 'OR'. Thus, a search for 'Electronic Scanner' or 'Electronic Searcher' seeks to formulate the search statement as 'Electronic AND (Scanner OR Searcher)'. 

Logical Difference 'NOT': Here, terms are combined by logical 'NOT'. If we formulate the search statement as A NOT B, we require that, for matching, A must be present in the index, record but B must be absent. Thus a search statement '(Automation AND Library) NOT Circulation' will retrieve all index records concerning 'Library automation' except 'Circulation'.

In this connection, it is to be noted that different OPACs have their own symbols used to indicate the Boolean operators (AND, OR, NOT) while formulating the search statement. The Boolean search method is also explained is BLIS - 06 and BLIS - 07 courses.

Truncation 

It is not necessary to specify complete  words. The system may allow for 'term truncation', where a fragment can be specified and the computer will pick up any term containing that fragment. This device is also known as 'Word fragment search'. Fragments may be truncated at either or both ends or at the middle. As for example: 

1452_types of truncation.png

The sign '*' is used to indicate truncation. The sign may vary from one system to another system. 

Posted Date: 10/26/2012 2:20:02 AM | Location : United States







Related Discussions:- Subject access to opac, Assignment Help, Ask Question on Subject access to opac, Get Answer, Expert's Help, Subject access to opac Discussions

Write discussion on Subject access to opac
Your posts are moderated
Related Questions
HUMAN RESOURCE DEVELOPMENT  OBJECTIVES Human resources constitute the most important of all resources of any organization. Attention to managing and modulating this resource

ORGANISATION OF DOCUMENTATION: The documentation and information centres at local levels that are attached to individual R&D institutions, business houses, industrial enterpri

Primary Sources: These are materials, which are original in  nature. They  usually take the form of a journal article, a  monograph, a dissertation,  a report or a patent or d

Question 1 You have been requested by your Superior to deliver a speech to a hundred parents on the importance of a balanced diet for their children. Describe the communication

Selective Dissemination of Information (SDI): The SDI is a type of current awareness service, the objective of which is to keep users of the system informed of new development

statistics are not mainly the records of the past but they are useful in the planing of the future. Discuss the statement and explain the role of statistics in economic planning.

QUESTION 1 a. Describe the 4 identity statuses put forward by James Marcia b. Adolescence is often described as a period of storm and stress [Hall. 1904]. Evaluate this clai

AACR 2- 1988 revised - L C descriptive rules: Anglo-American cataloging rules/ prepared under the direction of the Joint Steering Committee for Revision of AACR, a committee o


Public documentation/information centres: Established from public funds, these may not be self- supporting financially. In developing countries, documentation and information