Sunday, October 15, 2017

Z39.50

Z39.50


Z39.50 ➨ Z39.50 is a national and international standard defining a protocol for computer-to-computer information retrieval. It is a client–server, application layer communications protocol for searching and retrieving information from a database over a TCP/IP computer network. It is covered by ANSI/NISO standard Z39.50, and ISO standard 23950. The National Information Standards Organization of the United States (NISO) relating to libraries begin with Z39. To use Z39.50, you will need either special software or have an ILS with Z39.50 capabilities. Z39.50 acts like a “back door” into a library catalog. In order to download another library’s records, that library has to allow Z39.50 access to its catalog. If it does, though, there is no fee to pay the library providing the record.


CONTENTS


  • History
  • What Z39.50 Does
  • Advantages and Disadvantages
  • Modernization Efforts


READ MORE FROM SOURCE: Z39.50 : Glossary of Library & Information Science
https://librarianshipstudies.blogspot.com/2017/10/z3950.html

Saturday, October 14, 2017

Resource Description and Access RDA





Resource Description and Access (RDA) is a new library cataloging standard, successor to AACR2… … ...



Read original article in Librarianship Studies & Information Technology blog: RDA: Resource Description and Access


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Monday, August 14, 2017

PRECIS (Preserved Context Index System)

PRECIS (Preserved Context Index System)

PRECIS (PRESERVED CONTEXT INDEX SYSTEM)   PRECIS is an acronym for PREserved Context Index System or PREserved Context Indexing System. PRECIS is a computer assisted pre-coordinate subject indexing system developed by Derek Austin in 1968 as a result of long research which the Classification Research Group (CRG) undertook to give a new general classification for information control. In 1969 British librarians Derek Austin and Peter Butcher issued PRECIS: A rotated subject index system, published by the Council of the British National Bibliography. This appears to be the first published report on an innovative method for adding subject data in the form of descriptors to the computerized MARC record. This system is considered as the most important development in alphabetical approach to subject specification in recent years.

The system aims at providing an alphabetical subject index which is able to cater to the variant approaches of the users along with their context. In order to achieve this objective, the system arranges the components of a document,  into a significant sequence, thus, all the important components in the string are used as approach points. Simultaneously, the terms are displayed in such a fashion that every term is related to the next term in a context dependent way. Moreover, the system is amenable to computer operation, which further adds to the advantage of the system as the entries will be prepared and arranged automatically by the computer.

Contents
  • PRECIS (Preserved Context Index System)
  • Essential Features of PRECIS
  • Concept of PRECIS
  • PRECIS Indexing Procedure
  • Primary Operators
  • Secondary Operators
  • Primary Codes
  • Format of Entry
  • Filing Order
  • Conclusion



ALSO SHARED IN: Library and Information Science Articles and News in 2017

Wednesday, July 26, 2017

What are the Benefits of RDA?

What are the Benefits of RDA?

#RDA #CATALOGING #LIBRARIANSHIPSTUDIES

WHAT ARE THE BENEFITS OF RDA? / WHY IS RDA NEEDED?

[Main article: Resource Description and Access https://librarianshipstudies.blogspot.com/2017/07/resource-description-and-access.html]

=> RDA builds on the strengths of AACR2 but has some new features that make it more useful for description as a cataloging code for the digital environment in which libraries now operate.

=> RDA is better at catering for digital resources and for resources with multiple characteristics and will provide more guidance on the creation of authority headings.

=> RDA has been developed with the end-user in mind.

=> RDA provides a consistent, flexible and extensible framework for the description of all types of resources, including digital resources and those with multiple characteristics.
RDA is compatible with internationally established principles, models, and standards.

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