Saturday, April 29, 2017

Chain Indexing

Glossary of Library & Information Science
Glossary of Library & Information Science
CHAIN INDEXING   Chain Indexing or Chain Procedure is a mechanical method to derive subject index entries or subject headings from the class number of the document. It was developed by Dr. S.R. Ranganathan. He first mentioned this in his book “Theory of Library Catalogue” in 1938.

In Chain Procedure, the indexer or cataloguer is supposed to start from where the classifier has left. No duplication of work is to be done. He/she has to derive subject headings or class index entries from the digit by digit interpretation of the class number of the document in the reverse direction, to provide the alphabetical approach to the subject of the document.

Ranganathan designed this new method of deriving verbal subject heading in 1934 to provide the subject approach to documents through the alphabetical part of a classified catalogue. This method was distinctly different from the enumerated subject heading systems like Library of Congress Subject Headings (LCSH) or Sears List of Subject Headings (SLSH). He discerned that classification and subject indexing were two sides of the same coin. Classifying a document is the translation of its specific subject into an artificial language of ordinal numbers which results in the formation of a class number linking together all the isolate ideas in the form of a chain. This chain of class numbers is retranslated into its verbal equivalent to formulate a subject heading that represents the subject contents of the document. The class number itself is the result of subject analysis of a document into its facet ideas and linked together by a set of indicator digits, particularly when a classification system like Colon Classification is used for the purpose. As this chain is used for deriving subject entries on the basis of a set of rules and procedures, this new system was called ‘Chain Procedure’. This approach inspired in many other models of subject indexing developed afterward, based upon classificatory principles and postulates.

Chain Indexing was originally intended for use with Colon Classification. However, it may be applied to any scheme of classification whose notation follows a hierarchical pattern.

Contents

Chain Indexing
  • Steps in Chain Indexing
  • Example of Chain Indexing using Colon Classification
  • Merits of Chain Indexing
  • Demerits of Chain Indexing
  • Conclusion


Steps in Chain Indexing

According to Bhattacharya, there are eleven steps involved in Chain Procedure:
  1. Determination of the specific subject of the document.
  2. Expressive name of the subject
  3. Kernel terms
  4. Analysed name of subject
  5. Transformed  name of subject
  6. Standard terms
  7. Determination of links and construction of chain.
  8. Determination of different kinds of links
  9. Derivation of subject headings
  10. Preparation of cross reference entries
  11. Arrangement.
Determination of specific subject of the document - It is done with the help of the title of the document, its table of contents and by a careful perusal of the text. By analysing the subject contents of a document one arrives at its specific subject.

Expressive name of the subject - Naming the specific subject of the document expressively in the natural language.

Kernel terms - Representation of the name of the specific subject in Kernel terms (fundamental components). It is done by removing all the auxiliary words from the title.

Analyzed name of the subject - Determination of the category of each fundamental component according to a set of postulates and principles formulated for this purpose.

Transformed name of the subject - Transforming of the analysed name of subject by rearranging, if necessary, the fundamental components, according to a few additional postulates and principles formulated for the purpose of governing the syntax.

Standard terms - Standardization of each term, in the transformed name of the subject, in accordance with the standard terms used in the preferred scheme of classification.

Determination of links and construction of chain - Representation of class number in the form of a chain in which each link consists of two parts -- the class number and its translation in natural language. The class number and its translation is joined by “=” sign, and these signs are joined by downward arrows.

Determination of the different kinds of links - Determination of different kinds of links such as Sought Link (SL), False Link (FL), Unsought Link (USL) and Missing Link (ML).

FL : A  link is a false link if it ends with a connecting symbol or relation device, etc.

USL : A link in which a user is not likely to approach a document.

ML : A link in a chain-with-gap, corresponding to the missing isolate in the chain.

SL : A link in which a user is likely to approach a document.

Derivation of subject heading - Derivation of the subject heading from each of the sought links in the chain in a reverse rendering process.

Preparation of cross reference entries - In this step subject reference entry is prepared for specific subject entries.

Arrangement - In this last step all entries are merged and arranged in a single alphabetical sequence.


Example of Chain Indexing using Colon Classification

The document entitled ‘Macbeth’ by William Shakespeare, having class number O111,2J64,M will generate the following chain.

O                          =  Literature (SL)

O1                        =  Indo-European literature (USL)

O11                      =  Teutonic literature (USL)

O111                    =  English literature (SL)

O111,                   =  (FL)

O111,2                 =  English drama (SL)

O111,2J64            =  Shakespeare (SL)

O111,2J64,           =  (FL)

O111,2J64,M        =  Macbeth (SL)

Corresponding to these five sought links, the following subject heading or class index entries will be generated by the above chain:

DRAMA, ENGLISH = O111,2

ENGLISH LITERATURE = O111

LITERATURE = O

MACBETH, SHAKESPEARE (William) (1564) = O111,2J64,M

SHAKESPEARE (William) (1564) = O111,2J64


Merits of Chain Indexing
  1. This procedure, i.e., chain indexing can be applied with ease to any classification scheme whose notational symbols indicate the subordination of each step of division e.g. Colon Classification (CC), Dewey Decimal Classification (DDC), Library of Congress Classification (LCC), etc.
  2. Chain indexing saves the time of the indexer, as he makes use of the class number provided by the classifier, thus, avoiding duplication of work, in analysing the document and the formulation of class number.
  3. Chain indexing provides alternative approaches through reverse rendering to its classified file.
  4. As chain procedure is based on the structure of the classification scheme and on the terminology found in the schedules, its operation is speedy and semi-mechanical.
  5. Chain procedure is economical, as it drops each term after it has been indexed, thus, avoiding the permutation of component terms.
  6. In the case of chain indexing, only one index heading with complete subject formulation is prepared for a specific document. Other entries are prepared by the successive dropping of terms serve a successfully larger number of specific subjects. This provides the facility for generic as well as specific searches.
  7. Chain procedure is amenable to computerization. Programs have been successfully written to generate subject headings both from class numbers and feature headings following the reverse rendering method.
  8. Chain procedure may be used to derive indexes to classification schemes and books. Similarly, it may be used in formulating headings necessary for guide cards on catalogue, stock room guides, shelf guides, etc., in a systematic way.

Demerits of Chain Indexing
  1. It is totally dependent on a scheme of classification, as a result, it tends to suffer demerits related to the scheme of classification automatically.
  2. The entries prepared through chain indexing has only one specific entry, others are all broad entries.
  3. In chain indexing, sometimes a step of a division may go unrepresented, by a further digit of the class number. This creates the problem of the missing chain.
  4. Reverse rendering of terms, while preparing the entries is confusing to the user.

Conclusion

Chain indexing was first used by the Madras University Library in 1936. It has been widely accepted and used by British National Bibliography (BNB) from 1950-1970, LISA is based on Chain Indexing, Indian National Bibliography (INB) has been practicing chain indexing since 1958. Documentation Research & Training Centre (DRTC) has lately found that chain procedure is fully amenable to computerization. Programs have been written to generate subject heading from class numbers following reverse rendering method.


USED FOR
  • Chain Procedure

REFERENCES
  1. Information Access Through The Subject : An Annotated Bibliography / by Salman Haider. - Online : OpenThesis, 2015. (408 pages ; 23 cm.) 
    Information Access Through The Subject

SEE ALSO

ARTICLE AUTHOR

ARTICLE HISTORY
  • Written 2017-04-29

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Saturday, April 22, 2017

Library and Information Science News in 2017

Library and Information Science News
Library and Information Science News
Library and Information Science News is an initiative of Librarianship Studies & Information Technology blog to showcase the latest LIS news, articles, and updates for librarians, catalogers, metadata, archives, and knowledge professionals. It is an attempt to make a representative compilation of most popular news and stories for libraries and librarians which were shared through its Google+ Community, Facebook Page and other social media platforms of the Librarianship Studies & Information Technology blog in the year 2017.

Contents

  • Background
  • Librarianship Studies Categories (Labels)
  • Featured News
  • Library and Information Science News


BACKGROUND

I always wanted to keep myself updated with latest news and updates in Library and Information Science. I do this by reading various authoritative sources in the library and information science. Then I share it with the readers of Librarianship Studies & Information Technology blog which already has various followers of its social media platforms to share popular LIS news. So an idea came to my mind to create a blog article with top quality news on Library and Information Science which were most liked and shared. The newsfeed is sourced from Librarianship Studies & Information Technology Facebook Page and Librarianship Studies & Information Technology Google+ Community (which is organized based on the categories (or labels) of Librarianship Studies blog). 


LIBRARIANSHIP STUDIES CATEGORIES (LABELS)

Librarianship Studies & Information Technology is divided into following broad categories. Categories are listed on the top left side of the blog. These categories or labels group blog posts on a specific topic of Library & Information Science.


SCOPE: About Librarianship Studies & Information Technology blog.


SCOPE: On acquisitions or books, serials, e-resources, etc. in libraries in information centers. Collection Development--Books, Serials, Non-book Materials--Selection, Acquisition, Maintenance; ISBN, ISSN, Cataloguing-in-Publication (CIP), E-documents, E-books, E-journals, Etc.


SCOPE: On cataloging and metadata. Library Cataloguing Codes--RDA and AACR-II. Library Cataloguing--Cannons and Principles. Bibliographic Records--International Standards--ISBD, MARC21, BIBFRAME, and CCF. Etc. Indexing--Pre-coordinate,Post-coordinate.


SCOPE: Theory and practice of library classification and shelflisting. Classification schemes like Dewey Decimal Classification (DDC), Library of Congress Classification (LCC), Universal Decimal Classification (UDC), and Colon Classification (CC). Organization of knowledge/Information. Modes of formation of subjects. Library Classification--Cannon and Principles.


SCOPE: Glossary of Library and Information Science of the Librarianship Studies and Information Technology blog. Glossary of Library & Information Science is an encyclopedic glossary and dictionary of terms and acronyms of librarianship, library science, information science, and information technology. The terms of the glossary are given an encyclopedic treatment, they are more exhaustive than a typical glossary or dictionary entry but less than an article.


SCOPE: MLIS thesis of Salman Haider covering subject access and retrieval techniques in libraries. Annotated bibliography on Subject Approaches to Information in Libraries covering Subject Headings, Subject Indexing, Subject Cataloging, Library Classification, Artificial Intelligence, Expert Systems, and Subject Approaches in Bibliographic and Non-Bibliographic Databases etc.


SCOPE: Librarian's Reference Directory (or Librarians Reference Sources Directory) is a web directory of Library and Information Science reference sources on the World Wide Web.


SCOPE: Biography of famous librarians and history, practice, and techniques of librarianship. Description of library and information science. Library and Information Profession.


SCOPE: Famous and beautiful libraries the Library of Congress of Washington D.C., the British Library of London, and the Bodleian Library of Oxford. Library associations such as IFLA, ALA, and CILIP. Types of Libraries--National, Public, Academic, and Special (Objectives, structures, and functions).


SCOPE: Impact of libraries on society. Role of Information in Planning, Management, Socio-Economic Development, Technology transfer. Etc.


SCOPE: Library and digital marketing techniques and case studies. Includes social media marketing and search engine optimization.


SCOPE Study programs of top-ranked library schools or i-schools. Tutorial by noted professors of library and information science.


SCOPE: Use of technology in libraries. Databases--Search Strategies, Boolean Operators. Information Technology--Components; Impact of IT on Society. Computers--Hardware, Software, Storage Devices, Input/Output Devices. Networking--Concepts, Topologies, Types--LAN, MAN, WAN. Library Automation--Areas of automation, Planning, Hardware, and Software Selection, OPAC. Integrated Library Systems, Digital Libraries, Virtual Libraries, Etc.


SCOPE: Theory, practice, and techniques of library and knowledge management. Management--Principles, Functions, School of Thought. Planning, Organization Structure, Decision making. Human Resources Management--Manpower Planning, Job Analysis, Job Description, Selection, Recruitment, Motivation, Training and Development, Staff Manual, Leadership and Performance Evaluation. Financial Management--Resource Generation, Types of Budgeting, Cost and Cost Benefit Analysis. PERT, CPM. Library Buildings and Equipment, Performance Evaluation of Libraries/Information Centers and Services Marketing Information Product and Services, Total Quality Management (TQM).


SCOPE: Library circulation and loan activities. Types of Users, User Studies, User Education.


SCOPE: Miscellaneous topics in library and information science not cover by other Librarianship Studies blog labels.


SCOPE: Latest news in the library and information science.


SCOPE: Reference service in libraries and information centers. Reference and Information Services, Referral Service. Bibliographic Service, Indexing and Abstracting Service, CAS, SDI, Digest Service, Trend Report Online Services, Translation Services, Reprographic Services Etc.


SCOPE: On research methodology in the library and information science. Types of Research--Basic, Applied, Interdisciplinary. Research Design. Scientific Method, Hypothesis, Data Collection, Sampling. Methods of Research--Historical, Descriptive, Case Study, Survey, Comparative and Experimental. Statistical Methods, Data Analysis. Report Writing, Bibliometrics. Etc.


SCOPE: Reviews of books, journals, databases, e-resources, software, integrated library systems, Etc.


SCOPE: About subject headings. Library of Congress Subject Headings (LCSH), MESH, Sears List of Subject Headings etc. Vocabulary Control--Thesaurus, List of Subject Headings, Etc.


FEATURED NEWS

Universities redesign libraries for the 21st century: fewer books, more space - UC Berkeley’s newly remodeled undergraduate library is modern and sleek, with its top two floors featuring low-slung couches, a futuristic nap pod, and meeting spaces with glass walls made to be written on and colorful furniture meant to be moved. READ MORE


LIBRARY AND INFORMATION SCIENCE NEWS

Library and Information Science News in organized by broad areas "Categories (Labels)" of Librarianship Studies & Information Technology blog:


ACQUISITIONS & E-RESOURCES



CATALOGING & METADATA

Pre-Coordinate Indexing Systems - Nowadays most of the documents deal with complex and compound subjects, each comprising a number of components or concepts. The coordination of these component terms is either done at the input stage or at the output stage. The index in which the coordination of components (index terms) is done at the input stage, is known as a pre-coordinate index.  Coordination of index terms at the input stage means coordination of index terms at the time of preparation of the index by the indexer. In pre-coordinate indexing, a number of selected terms or keywords are coordinated by the indexer and the cards are prepared for display to the users. READ MORE: Pre-Coordinate Indexing Systems

Cataloging & Metadata Services Infographics - Information and graphical representation of cataloging and metadata services. READ MORE

Index -  The term ‘index’  has been derived from the Latin word ‘indicare’ which means to indicate or to point out. Here it refers to guide to a particular concept in a document. READ MORE: Index

Title-Based Indexing - There is one part of a document in which authors themselves usually try to define the subject: the title. The title in itself is a one line summary of a document and this serve as an index point, hence, title indexes came into force. READ MORE: Title-Based Indexing

Key-Term Alphabetical (KEYTALPHA) - In the Key-Term Alphabetical index, keywords are arranged side by side without forming a sentence. Entries are prepared containing only keywords and location excluding the context. READ MORE: Key-Term Alphabetical (KEYTALPHA)

Keyword in Context (KWIC) Indexing. READ MORE: Keyword in Context (KWIC) Indexing

Citation Indexing - Citation index is an ordered list of cited articles along with a list of citing articles. The cited article is identified as the reference and the citing article as the source.  READ MORE: Citation Indexing

Keyword Out of Context (KWOC) - In KWOC system, keyword or the access point is shifted to the extreme left at its normal place in the beginning of the line. It is followed by the complete title to provide complete context. READ MORE: Keyword Out of Context (KWOC)

Outsourcing Cataloging Tasks READ MORE

Chain Indexing - Chain Indexing or Chain Procedure is a mechanical method to derive subject index entries or subject headings from the class number of the document. READ MORE: Chain Indexing


CLASSIFICATION & SHELFLISTING



GLOSSARY OF LIBRARY & INFORMATION SCIENCE



INFORMATION ACCESS THROUGH THE SUBJECT



LIBRARIAN'S REFERENCE DIRECTORY

Library and Information Science Videos - Library and Information Science Videos is an initiative of Librarianship Studies & Information Technology blog to showcase the finest LIS videos for librarians, catalogers, metadata, archives, and knowledge professionals. The videos are sourced from Librarianship Studies & Information Technology YouTube Channel which are organized based on the categories (or labels) of Librarianship Studies blog. READ MORE: Library and Information Science Videos


LIBRARIANS & LIBRARIANSHIP

A library without librarians is a just a shed full of books. READ MORE

America’s Librarian - Carla Hayden plans to continue her career-long focus on access and technology as Librarian of Congress. READ MORE

Carla Hayden Takes Charge of the World's Largest Library. KNOW MORE

Will Librarians Be The Overseers Of The Information Age? - Julie Todaro, President of the American Library Association, ALA and Eleni Miltsakaki, founder and CEO of Choosito! sat down with Rod Berger to discuss the role of librarians in today's schools. Contrary to the widely held notion that the role of the librarian is shrinking, both Todaro and Miltsakaki make strong arguments for the increased importance of librarians as overseers of an endless stream of Internet data. Todaro and Miltsakaki agree that students, more than ever, need the guidance of librarians in their educational lives. READ MORE


LIBRARIES & ASSOCIATIONS

Universities redesign libraries for the 21st century: fewer books, more space - UC Berkeley’s newly remodeled undergraduate library is modern and sleek, with its top two floors featuring low-slung couches, a futuristic nap pod, and meeting spaces with glass walls made to be written on and colorful furniture meant to be moved. READ MORE

The 8 most beautiful new libraries in the world - Photos of beautiful libraries. READ MORE

State of America's Libraries Report 2017 - In the 21st century, libraries of all types are responding to the changing social, economic, and political impacts of living in a digital society. Academic, school, and public libraries provide services that empower people for change. Library workers’ expertise, combined with dynamic collections and digital resources, help individuals develop new skills, communicate with others through new technologies, and help make their communities better places to live. These and other library trends of the past year, including the Top Ten Most Challenged Books of 2016, are detailed in the American Library Association’s 2017 State of America’s Libraries report. READ MORE

The Future of Libraries (Massachusetts Institute of Technology) - READ MORE

The most beautiful library in every major US city READ MORE

Former National Library of France reopens after a decade of renovation work - the former site of france’s national library has reopened after years of renovation work by architects bruno gaudin and virginie brĂ©gal. located at rue de richelieu in paris, the historic complex houses the collections and reading rooms of the manuscripts department, the maps and plans branch, the coins, medals and antiques bureau, and the performing arts office. since 1993, the quadrangle has also been home to the french national art history library. KNOW MORE


LIBRARIES & SOCIETY

7 Reasons Libraries Are Essential, Now More Than Ever. READ MORE


LIBRARY & DIGITAL MARKETING

9 Vital Ways Facebook is the Best Partner for Libraries. READ MORE

Librarians: Digital Marketing Needs Your Skills. READ MORE


LIBRARY & INFORMATION SCIENCE EDUCATION



LIBRARY & INFORMATION TECHNOLOGY

Timothy Cole Wins 2017 LITA/OCLC Kilgour Research Award - Timothy Cole, Head of the Mathematics Library and Professor of Library and Information Science at the University of Illinois Urbana-Champaign, has been selected as the recipient of the 2017 Frederick G. Kilgour Award for Research in Library and Information Technology. READ MORE

Top Library Automation Software Products READ MORE

How Mobile Technology Changes the Library Experience - The library experience of today is greatly different from that of even 15 years ago, and mobile technology is the leading contributor to these changes. In response, public and college libraries are using mobile technology to increasingly enhance the user experience. By embracing the many growing capabilities of mobile technologies, libraries provide better service to their users in many different ways. Here are just some of those ways. READ MORE

University Libraries Collaborate on Web Discoverability Project - Stanford and Cornell are leading library efforts to help machines understand bibliographic information so it will be searchable on the Web. KNOW MORE


LIBRARY & KNOWLEDGE MANAGEMENT



LIBRARY CIRCULATION



LS & IT MISCELLANEOUS TOPICS



REFERENCE SERVICE



RESEARCH METHODOLOGY



REVIEWS--BOOK JOURNAL DATABASE SOFTWARE ILS ETC



SUBJECT HEADINGS




SEE ALSO

ARTICLE AUTHOR

ARTICLE HISTORY
  • Written 2017-04-22

FEEDBACK
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Thanks all for your love, suggestions, testimonials, likes, +1, tweets, and shares ...

Saturday, April 15, 2017

Pre-Coordinate Indexing Systems

Information Access Through The SubjectGlossary of Library & Information Science

PRE-COORDINATE SUBJECT INDEXING SYSTEMS

Nowadays most of the documents deal with complex and compound subjects, each comprising a number of components or concepts. The coordination of these component terms is either done at the input stage or at the output stage. The index in which the coordination of components (index terms) is done at the input stage, is known as a pre-coordinate index.  Coordination of index terms at the input stage means coordination of index terms at the time of preparation of the index by the indexer. In pre-coordinate indexing, a number of selected terms or keywords are coordinated by the indexer and the cards are prepared for display to the users.
          
Examples: Ranganathan’s Chain Indexing, G. Bhattacharya’s POPSI, and Derek Austin’s PRECIS,  COMPASS,  etc.
          
Pre-coordinate indexing systems are conventional systems mostly found in printed indexes. In this type of system, a document is represented in the index by a heading or headings comprising of a chain or string of terms. These terms taken together are expected to define the subject content of the document. The leading term determines the position of the entry in the catalog or index, while the other (qualifying) terms are subordinated to it. Since the coordination of terms in the index description is decided before any particular request is made, the index is known as a pre-coordinate index. Pre-coordinate indexes are mostly prevalent as printed indexes. For example, the indexes to abstracting and indexing journals, national bibliographies and subject indexes to library catalogs apply principles of pre-coordinate indexing in varying measures. Such indexes are compiled both manually as well as with the help of a computer.
          
Thus, the pre-coordinate index constitutes a collection of index entries in which concepts from documents are coordinated according to a plan using a linear sequence at the time of the index headings are prepared. These concepts are then represented either by symbols (when using a scheme of classification) or words of the indexing language in use. The next step is to synthesize or to put the components in an order recommended by the rules of the language. This means that the concepts are pre-coordinated and the index file consisting of a collection of such pre-coordinated concepts that are available in the library’s collection of documents. These pre-coordinated indexes when arranged alphabetically are known as alphabetical subject indexes or alphabetical subject catalogs.  When arranged according to a scheme of classification they are known as classified indexes or classified catalogs.

REFERENCES

Information Access Through The Subject : An Annotated Bibliography / by Salman Haider. - Online : OpenThesis, 2015. (408 pages ; 23 cm.)

Annotated bibliography titled Information Access Through The Subject covering Subject Indexing, Subject Cataloging, Classification, Artificial Intelligence, Expert Systems, and Subject Approaches in Bibliographic and Non-Bibliographic Databases etc. 

MLIS Thesis is available and discussed in following places: 
Information Access Through The Subject

The project "annotated bibliography" was worked out as Master of Library & Information Science (MLIS) dissertation in the Department of Library and Information Science, A.M.U, IndiaInformation Access Through The Subject is a very much appreciated work (see Testimonials). It earned the author S. Bashiruddin – P. N. Kaula Gold Medal, Post Graduate Merit Scholarship, First Division, and IInd Position in the MLIS program.


SEE ALSO

ARTICLE AUTHOR

ARTICLE HISTORY
  • Written 2017-04-15

FEEDBACK
  • Help us improve this article! Contact us with your feedback.

Thanks all for your love, suggestions, testimonials, likes, +1, tweets, and shares ...

Saturday, April 1, 2017

Library and Information Science Videos

Library and Information Science Videos is an initiative of Librarianship Studies & Information Technology blog to showcase the finest LIS videos for librarians, catalogers, metadata, archives, and knowledge professionals. The videos are sourced from Librarianship Studies & Information Technology YouTube Channel which are organized based on the categories (or labels) of Librarianship Studies blog.

A featured video will be displayed in this blog post along with a brief summary. It will also be displayed at the bottom of the blog in a large view (recommended). It is important to note that the large view of the featured video is available only in the web version. So if you are viewing on a mobile phone or some mobile device then go to the bottom of the blog post area to locate and visit the option "View web version" to find the featured video.

This article forms a part of Librarian's Reference Directory and Glossary of Library & Information Science.

Librarian's Reference DirectoryGlossary of Library & Information Science

Contents

  • Background
  • Featured Video
  • Librarianship Studies Categories (Labels)
  • Videos in Librarianship Studies & Information Technology YouTube Channel

BACKGROUND

I always wanted to see beautiful libraries of the world like the Library of Congress of Washington D.C., the British Library of London, and the Bodleian Library of Oxford. I also wanted to view Library and Information Science tutorial videos by top-ranked library and i-schools. There are some topics which cannot be demonstrated effectively through text (as in article form), where video format is preferred. For example, if the subject is like Use of Robots In Libraries, then it would be more interesting to see a video showing robots in action in libraries. Likewise, a biography of a library and information science luminary like Dr. S. R. Ranganathan, Dr. Carla Hayden, Lois Mai Chan, or Charles Ammi Cutter should better be viewed in a video. So an idea came to my mind to create a YouTube Channel on Library and Information Science with top quality videos on the pattern of Khan Academy.

Library and Information Science Videos supports the purpose of Librarianship Studies & Information Technology to provide leadership for the development, promotion, and improvement of library and information services and the profession of librarianship in order to enhance learning and ensure access to information for all. Librarianship Studies & Information Technology blog is envisioned as the BritannicaThe Huffington PostKhan Academy, and more closely like the Encyclopedia of Library and Information Sciences; an authoritative source for consultation and reference for any library or information profession related issue and a treasure hub of knowledge on Library and Information Science, which is open and free for all the library professionals worldwide.

FEATURED VIDEO



Journey of a Collection Item [in British Library] - [Watch this video on the large screen at the bottom of Librarianship Studies & Information Technology blog - Recommended] - Follow the journey of a collection item from arrival at the British Library until it reaches a Reader’s desk. The British Library is the national library of the United Kingdom and the second largest library in the world by number of items cataloged. The video shows the activities by the library staff of initial registration of the book followed by acquisitions, cataloging, and classification to placing of the book on shelves and then from the shelves to the readers at circulation desk. Some important information provided in the interview: It holds well over 150 million items from many countries. Over 50,000 items processed every month. 625 km of shelves grows by 12 km every year. The video ends with a quote "Every reader his or her book; Every book its reader" by S.R. Ranganathan. If you ask me to describe this video in one word, it's AMAZING. Watch this video on Librarianship Studies & Information Technology YouTube Channel.

LIBRARIANSHIP STUDIES CATEGORIES (LABELS)

Librarianship Studies & Information Technology is divided into following broad categories. Categories are listed on the top left side of the blog. These categories or labels group blog posts on a specific topic of Library & Information Science.


SCOPE: About Librarianship Studies & Information Technology blog.


SCOPE: On acquisitions or books, serials, e-resources, etc. in libraries in information centers. Collection Development--Books, Serials, Non-book Materials--Selection, Acquisition, Maintenance; ISBN, ISSN, Cataloguing-in-Publication (CIP), E-documents, E-books, E-journals, Etc.


SCOPE: On cataloging and metadata. Library Cataloguing Codes--RDA and AACR-II. Library Cataloguing--Cannons and Principles. Bibliographic Records--International Standards--ISBD, MARC21, BIBFRAME, and CCF. Etc. Indexing--Pre-coordinate,Post-coordinate.


SCOPE: Theory and practice of library classification and shelflisting. Classification schemes like Dewey Decimal Classification (DDC), Library of Congress Classification (LCC), Universal Decimal Classification (UDC), and Colon Classification (CC). Organization of knowledge/Information. Modes of formation of subjects. Library Classification--Cannon and Principles.


SCOPE: Glossary of Library and Information Science of the Librarianship Studies and Information Technology blog. Glossary of Library & Information Science is an encyclopedic glossary and dictionary of terms and acronyms of librarianship, library science, information science, and information technology. The terms of the glossary are given an encyclopedic treatment, they are more exhaustive than a typical glossary or dictionary entry but less than an article.


SCOPE: MLIS thesis of Salman Haider covering subject access and retrieval techniques in libraries. Annotated bibliography on Subject Approaches to Information in Libraries covering Subject Headings, Subject Indexing, Subject Cataloging, Library Classification, Artificial Intelligence, Expert Systems, and Subject Approaches in Bibliographic and Non-Bibliographic Databases etc.


SCOPE: Librarian's Reference Directory (or Librarians Reference Sources Directory) is a web directory of Library and Information Science reference sources on the World Wide Web.


SCOPE: Biography of famous librarians and history, practice, and techniques of librarianship. Description of library and information science. Library and Information Profession.


SCOPE: Famous and beautiful libraries the Library of Congress of Washington D.C., the British Library of London, and the Bodleian Library of Oxford. Library associations such as IFLA, ALA, and CILIP. Types of Libraries--National, Public, Academic, and Special (Objectives, structures, and functions).


SCOPE: Impact of libraries on society. Role of Information in Planning, Management, Socio-Economic Development, Technology transfer. Etc.


SCOPE: Library and digital marketing techniques and case studies. Includes social media marketing and search engine optimization.


SCOPE Study programs of top-ranked library schools or i-schools. Tutorial by noted professors of library and information science.


SCOPE: Use of technology in libraries. Databases--Search Strategies, Boolean Operators. Information Technology--Components; Impact of IT on Society. Computers--Hardware, Software, Storage Devices, Input/Output Devices. Networking--Concepts, Topologies, Types--LAN, MAN, WAN. Library Automation--Areas of automation, Planning, Hardware, and Software Selection, OPAC. Integrated Library Systems, Digital Libraries, Virtual Libraries, Etc.


SCOPE: Theory, practice, and techniques of library and knowledge management. Management--Principles, Functions, School of Thought. Planning, Organization Structure, Decision making. Human Resources Management--Manpower Planning, Job Analysis, Job Description, Selection, Recruitment, Motivation, Training and Development, Staff Manual, Leadership and Performance Evaluation. Financial Management--Resource Generation, Types of Budgeting, Cost and Cost Benefit Analysis. PERT, CPM. Library Buildings and Equipment, Performance Evaluation of Libraries/Information Centers and Services Marketing Information Product and Services, Total Quality Management (TQM).


SCOPE: Library circulation and loan activities. Types of Users, User Studies, User Education.

SCOPE: Miscellaneous topics in library and information science not cover by other Librarianship Studies blog labels.


SCOPE: Latest news in the library and information science.


SCOPE: Reference service in libraries and information centers. Reference and Information Services, Referral Service. Bibliographic Service, Indexing and Abstracting Service, CAS, SDI, Digest Service, Trend Report Online Services, Translation Services, Reprographic Services Etc.


SCOPE: On research methodology in the library and information science. Types of Research--Basic, Applied, Interdisciplinary. Research Design. Scientific Method, Hypothesis, Data Collection, Sampling. Methods of Research--Historical, Descriptive, Case Study, Survey, Comparative and Experimental. Statistical Methods, Data Analysis. Report Writing, Bibliometrics. Etc.


SCOPE: Reviews of books, journals, databases, e-resources, software, integrated library systems, Etc.


SCOPE: About subject headings. Library of Congress Subject Headings (LCSH), MESH, Sears List of Subject Headings etc. Vocabulary Control--Thesaurus, List of Subject Headings, Etc.


VIDEOS IN LIBRARIANSHIP STUDIES & INFORMATION TECHNOLOGY YOUTUBE CHANNEL

Library and Information Science Videos in Librarianship Studies & Information Technology YouTube Channel playlists which are named and organized by broad areas "Categories (Labels)" of Librarianship Studies & Information Technology blog:


ABOUT LS & IT BLOG




ACQUISITIONS & E-RESOURCES



CATALOGING & METADATA



CLASSIFICATION & SHELFLISTING



GLOSSARY OF LIBRARY & INFORMATION SCIENCE



INFORMATION ACCESS THROUGH THE SUBJECT



LIBRARIAN'S REFERENCE DIRECTORY



LIBRARIANS & LIBRARIANSHIP

Dr. Carla Hayden: President Obama's Nominee For The Librarian Of Congress - This video is created by Obama White House Archives to introduce Dr. Carla Hayden as President Obama's Nominee For The Librarian Of Congress. See Dr. Carla Hayden in action as she speaks about her career and experience as a librarian, and tour the Library of Congress and Enoch Pratt Free Library with this incredible video. Watch this video on Librarianship Studies & Information Technology YouTube Channel.



LIBRARIES & ASSOCIATIONS

Inside the Bodleian: Building a 21st Century Library - A fascinating behind-the-scenes look at the inner workings of Oxford's vast main library, the Bodleian, and how its staff are working to make this ancient institution ready for future generations of readers. Watch this video on Librarianship Studies & Information Technology YouTube Channel.



Journey of a Collection Item [in British Library] - Follow the journey of a collection item from arrival at the British Library until it reaches a Reader’s desk. The British Library is the national library of the United Kingdom and the second largest library in the world by number of items cataloged. The video shows the activities by the library staff of initial registration of the book followed by acquisitions, cataloging, and classification to placing of the book on shelves and then from the shelves to the readers at circulation desk. Some important information provided in the interview: It holds well over 150 million items from many countries. Over 50,000 items processed every month. 625 km of shelves grows by 12 km every year. The video ends with a quote "Every reader his or her book; Every book its reader" by S.R. Ranganathan. If you ask me to describe this video in one word, it's AMAZING. Watch this video on Librarianship Studies & Information Technology YouTube Channel.



LIBRARIES & SOCIETY



LIBRARY & DIGITAL MARKETING



LIBRARY & INFORMATION SCIENCE EDUCATION




LIBRARY & INFORMATION TECHNOLOGY



LIBRARY & KNOWLEDGE MANAGEMENT



LIBRARY CIRCULATION



LS & IT MISCELLANEOUS TOPICS



LS & IT NEWS



REFERENCE SERVICE



RESEARCH METHODOLOGY



REVIEWS--BOOK JOURNAL DATABASE SOFTWARE ILS ETC



SUBJECT HEADINGS



SEE ALSO

ARTICLE AUTHOR

ARTICLE HISTORY
  • Last Updated 2017-04-14
  • Written 2017-04-01

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  • Jayaram Haravu (or L. J. Haravu), Managing Trustee at Kesavan Institute of Information and Knowledge Management (KIIKM) and Pioneer of Open Source Library Software movement in India, creator of  NewGenLib (www.newgenlib.com) integrated library system, [April 3, 2017, E-mail in LIS-Forum, PCCLIST, AUTOCAT on article Library and Information Science Videos and Resource Description & Access (RDA) blog] -- I congratulate Salman Haider for bringing to our notice this excellent initiative. I am sure this will be an invaluable source to teachers and students of librarianship and information studies. I have been a silent observer and admirer of your commitment to de-mystifying RDA for several years now. What you are doing is most commendable. I wonder, though, how many have taken advantage of your knowledge.

Thanks all for your love, suggestions, testimonials, likes, +1, tweets, and shares ...

Friday, March 17, 2017

Vocabulary Control

Information Access Through The Subject

VOCABULARY CONTROL

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

Subject Heading List

Subject heading has been defined as a word or group of words indicating a subject under which all materials dealing with the same theme is entered in a catalogue or bibliography, or is arranged in a file.

A vocabulary control device depends on a master list of terms that can be assigned to documents. Such a master list of terms is called ‘List of Subject Headings’. A list of subject headings contains the subject access terms (preferred terms) to be used in the cataloguing or indexing operation at hand.

List of Subject Headings-General Principles

The general principles that guide the indexers in the choice and rendering of subject headings from the standard list of subject headings are discussed in the following sub-sections:

Specific and Direct Entry - The principles of specific and direct entry require that a document be assigned directly under the most specific subject that accurately and precisely represents its subject content.

Common Usage - This principle states that the word(s) used to express a subject must represent common usage.

Uniformity - The principle of uniform heading is adopted in order to show what the library collection has on a given subject. One uniform term must be selected from several synonyms and this term must be applied consistently to all documents on the topic. The heading chosen must also be unambiguous. Similarly, if there are variant spellings of the same term or different possible forms of the same headings, only one is used as the heading.

Consistent and Current Terminology - A term chosen on the basis of common usage may become obsolete with the passage of time. Subsequently, a list of subject headings may incorporate current terminology. In such a situation a subject authority file is to be maintained.  Once a heading is changed, every record that was linked to the old heading can be linked to the new heading and this decision is recorded in the subject authority file.

Form Heading - In addition to the subject headings, there are form headings that have the same appearance as topical subject headings but refer to the literary or artistic form or form of material. Libraries that want to provide access to these kinds of materials may assign appropriate form headings to individual works as well as to collections and materials about the form.

Cross Reference - Cross-references direct the user from terms not used as headings to the term that is used, and from broader and related topics to the one chosen to represent a given subject. Three types of cross-references are used in the subject headings structure. These are discussed below:

a) See (or USE) references - These references guide users from terms that are not used as headings to the authorized headings for the subject in question. ‘See’ or ‘USE’ references ensure that in spite of different names for a given subject a user still be able to locate materials on it.

b) See also (including BT, NT, and RT) references - These references guide users to the headings that are related either hierarchically or associatively and are used as entries in the catalogue. By connecting related headings, the ‘See also’ (RT, for related term) references draw the user’s attention to material related to his interest. By linking hierarchically related headings, ‘See also’ (BT, for broader form; NT, for narrower term) references help the user to search specific aspects of his subject of interest.

c) General references - General references direct the user to a group or category of headings instead of individual headings. It is sometimes called a ‘blanket reference’. The provision of general references in the standard list of subject headings obviate the need to make long lists of specific references and thus ensure economy of space.

Thesaurus

An indexing language is a language used to describe the subject or another aspect of the document in an index. The authority list that helps to encode the documents’ subject at the input stage (index terms) and also at searching stage (search terms) is called as a thesaurus.

A more formal definition of a thesaurus might be: An organized list of terms from a specialized vocabulary arranged to facilitate the selection of index terms as well as search terms.

A thesaurus differs from a conventional authority list such as Sear’s List, in that the terms are not necessarily alone but may be coordinated with other terms. The relationships between the terms are clearly defined by use of the following standard abbreviations:-
  • SN    Scope Note
  • UF    Used For
  • BT    Broader Term
  • RT    Related Term
  • SA    See Also
The alphabetical listing of index terms in a thesaurus consists of following types of terms:

a) Descriptor - That can be used as index terms to describe concepts contained in a document. this is also known as ‘preferred term’.

b) Non-descriptor - That cannot be used as index terms but appear in the thesaurus to expand entry words of the indexing language. They are also known as ‘non-preferred terms’.

Example:
Abressive Paper     (Preferred term/descriptor)
UF     Sand Paper   (non preferred term/non descriptor)
BT     Paper           (non preferred term/non descriptor)
RT     Abressives    (non preferred term/non descriptor)

Structure of Thesaurus

The internal form of individual entries and the arrangement of various entries in relation to one another constitute the structure of thesaurus. Cross-references make explicit the way in which entries relate to each other in a network of concepts. Each entry in a thesaurus consists of a pack of terms, which are related to it in different ways. The  different terms in the entry are displayed in the following format:
  • DESCRIPTOR (with scope note whenever needed)
  • Synonyms and quasi-synonyms (displaying equivalence relationship and denoted by the relationship indicator USE/UF (Use for)
  • Broader Terms (displaying hierarchical-superordinate relationship and denoted by BT)
  • Narrower Terms (displaying hierarchical-subordinate relationship and denoted by NT)
  • Related Terms (displaying associate relationship and denoted by RT)

A thesaurus may be either alphabetical, or classified, and it may or may not include a graphical display. In an alphabetical thesaurus, the descriptors followed by their relationships are listed in alphabetical sequences. In a classified thesaurus, the descriptors are listed in accordance with the hierarchical relationships represented in the thesaurus. The various levels of the hierarchy are shown by appropriate indentations. The graphical displays are multi-dimensional ways of representing the relationships between terms. Such relationships are indicated by arrows lines or by presenting term in concentric circles showing hierarchy.
Reciprocal entries appear for each term in a thesaurus whenever a relationship, whether hierarchical or non-hierarchical, is established between two terms.

Relationship Between Terms

The inter-relationships between the terms in a thesaurus are brought out by two basic types of relationships: (1) Hierarchical relationships, and (2) Non-hierarchical relationships.

Hierarchical Relationships - Hierarchical relationships refers to super-ordinate and subordinate relationship for a concept. this relationship may be of three types:
a) Genus-Species (Generic) relationship
b) Hierarchical Whole-Part relationship
c) Instance relationship

a) Genus-species (Generic) Relationship links genus and species and represents the basis of scientific, taxonomic system. As for example,

    Rodents
    NT Mice

    Mice
    BT Rodents

Here, ‘rodents’ is a genus (broader concept) while ‘Mice’  represents its species (narrower concept).

b) Hierarchical Whole-Part Relationship means that the name of a part implies the name of its whole in any context. As for example,

    Cardio-Vascular System
    BT Circulatory System

    Circulatory System
    NT Cardio-Vascular System

Here ‘Cardio-Vascular System’ always refers to a part of its whole ‘Circulatory System’.

c) Instance Relationship occurs in a particular instance, which links proper name with a common noun. As for example,

    Mountain Regions
    NT Alps

    Alps
    BT Mountain Regions

    Mountain Regions
    NT Himalayas

    Himalayas
    BT Mountain Regions

Instance relationship is often not shown in a thesaurus to control its size.

Non-hierarchical Relationship - When two terms are related other than hierarchical, the relationship may be called non-hierarchical relationship. This relationship may be further grouped as:
a) Equivalence (or preferential) relationship, and
b) Associative  (or affinitive) relationship.

a) Equivalence (or Preferential) Relationship - Usually, it refers to the preferred terms and distinguishes such terms from the non-preferred terms. The symbol used to represent these relationships in a thesaurus are USE and UF (Used for). It will cater for controlling the following problems:


(i)
Synonyms:
Disabilities
USE Handicaps
Handicaps
UF Disabilities
(ii)
Antonyms:
Temperance
USE Intemperance
Intemperance
UF Temperance
(iii)
Spelling Variant:
Labour
USE Labor
Labor
UF Labour
(iv)
Abbreviation:
Polyvinyl chloride
USE PVC
PVC
UF Polyvinyl Chloride
(v)
Specific to general:
Alsatiens
USE Dogs
Dogs
UF Alsatiens

b) Associative (or Affinitive) Relationship - This relationship is employed to cover other relationship between terms that are related but are neither consistently hierarchical nor equivalent. In other words, here two terms are conceptually associated on a number of different basis while satisfying the requirement that one of the terms should function as a component in any explanation or definition of the other. They are indicated by the code RT (Related Term). Some examples of associative relationships are demonstrated below:

i) A discipline or field of study and the object or phenomenon studied:
Birds                             Ornithology
RT Ornithology             RT Birds

ii) An action and its property:
Indexing                        Efficiency
RT Efficiency                RT Indexing

iii) An action and resulting product:
Weaving                       Cloth
RT Cloth                       RT Weaving

iv) Coordinate ideas:
Classification                Cataloguing
RT Cataloguing            RT Classification

v) Ideas having common elements in their definition:
Management                Administration
RT Administration        RT Management

Thesauri and Subject Headings List

Both thesauri and subject headings list are vocabulary control devices, but they are used in different situation. The essential characteristics which differentiate them are considered in the following sections:

a) Subject headings list fulfills the needs of pre-coordinate indexes, whereas a thesauri is designed to meet specific needs of post-coordinate indexes.

b) Thesauri generally contain terms that are more specific than these found in conventional subject heading list.

c) A thesaurus normally avoids inverted terms such as ‘Psychology, children’.

d) The relationship display is more extensive in the case of thesaurus than in the case of traditional subject headings list. Incidentally, some well-known subject headings list such as Library of Congress Subject Headings and Sear’s List of Subject Headings, in their latest editions, have adopted thesaurus format, thereby showing the relationships existing between terms.

e) The relationships between terms listed in a thesaurus are not transferred to the indexes in many cases Dictionary Catalogues normally provide ‘See’ and ‘See also’ references linking the related subject headings.

The above are some significant aspects that distinguish a thesaurus from a conventional subject heading list.

Thesauri and Classification Schemes

A classification scheme, especially a faceted and hierarchical one, is able to show hierarchical, faceted and phase relationships, but often misses other associative and equivalence relationships. However, the real difference between a classification scheme and a thesaurus lies in their purpose and use.

Thesauro-Facet

This concept has been developed by Jean Aitchison and others for English  Electric Company. It is basically a faceted classification, integrated with a thesaurus. Thesauro-Facet consists of two sections: a) faceted classification scheme, and b) alphabetical thesaurus. Here, the thesaurus replaces the alphabetical subject index, which normally follows the schedules in a conventional faceted classification. Terms appear twice once in the schedule and once in the alphabetical thesaurus, the link between two locations being the notation or class number. It can be used in both pre-and post-coordinate indexing systems.

Classaurus

It is also a vocabulary control device developed by Dr. Ganesh Bhattacharya at DRTC that incorporates in itself features of both a faceted classification scheme as well as that of a conventional alphabetical thesaurus. It is an elementary category-based (faceted) systematic scheme of hierarchical classification in verbal plane incorporating all the necessary and sufficient features of a conventional information retrieval thesaurus. Like any classification scheme, it displays hierarchical relationships among terms in its schedules. Like a faceted classification scheme, there are separate schedules for each of the Elementary Categories (Entity, Property, and Action) and for common modifiers like Form, Time, Place, and Environment. Like any thesaurus, each of the terms in the hierarchic schedules is enriched by synonyms, quasi-synonyms, etc. Unlike a thesaurus, a classaurus does not include other associatively related terms (RTs) because of its category-based (faceted) structure. It is said that a term in one elementary category has a high chance of being associatively related with another term in another category depending on the subject of the document. It is assumed that RTs should not be dictated by the designer of the classaurus, rather it should be dictated by the document itself since any term may be associatively related to other terms depending on the nature of the thought content of the document. The classaurus has two parts: the Systematic Part and the Alphabetical Index Part.
The Systematic Part consists of common modifiers. Each entry in the Systematic Part consists of Descriptor; Definition/Scope Note (whenever needed, Synonyms (UF), if any, parts, and species/types. The hierarchy of terms is shown by indentation indicated by ‘.’ (dot). Terms in an array are arranged according to alphabetical order. Each term in the Systematic Part is assigned a  unique alphanumeric code. The Alphabetical Index Part to the Classaurus contains each and every term including synonyms occurring in the Systematic Part along with its address (i.e. alphanumeric code).

Systematic Arrangement

The above discussion on showing semantic relationships is related to one method of arrangement, the alphabetical.  We can also show relationships by juxtaposition, that is, grouping related concepts together in a systematic arrangement to form a classification scheme. Such an arrangement will show hierarchical relationships as well as coordinate relationships, and may well also show others such as instruments and materials. In this way, a substantial part of the cross-reference structure required by an alphabetical arrangement is eliminated, because the relationships are shown by the way that the concepts are grouped. We normally arrange books on the shelves of a library in this way in order to help the user, who will find the books they are interested in shelves in the same area.

There is, however, a price to be paid for this advantage. If we group our preferred terms systematically, then the order in which they occur is no longer self-evident, and we are forced to introduce a notation or code vocabulary to show the order and enables to find particular concepts among the systematic arrangement. The entry vocabulary now becomes doubly important, because not only does it contain all the non-preferred terms as well as the preferred terms, but being arranged alphabetically-it also forms our only means of access to the systematic arrangement, via the voice vocabulary. We need to look up terms in which we are interested in the entry vocabulary, which will tell us what codes have been used to denote them:

Electronics    621.381    (DDC)
Cyclotrons    621.384.61    (UDC)
Disease (Medicine)    L:491    (CC6)

Equivalence relationships are catered for by simply showing the same code for each; in fact, all the entries in the entry vocabulary may be regarded as equivalence relationships, in that they show the heading used for arrangement (in this case a piece of notation) for both preferred and non-preferred terms. In the schedules of the scheme, i.e. the list of index vocabulary terms in systematic order, we shall find only the preferred terms.
Another problem arises because, of the occurrences of a concept in more than one hierarchy, where we find both generic, permanent, relationships, and quasi-generic relationships representing applications. So the same basic concept may be represented by more than one code, depending on the context within which it appears:

Tobacco
                  botany                 583.29
                  hygiene                613.8
                  social customs     394.1

Systematic arrangement can show many of the categories of relationships we have identified, either by juxtaposition in the schedules or by the complementary juxtaposition of entries in the alphabetical sequence of the entry vocabulary. However, this does not cover all the affinitive/associative group, some of which may actually be hidden by the arrangement. The only way in which these may be drawn to the attention of the indexer or searcher is through cross-references in the schedules or in the entry vocabulary. Unfortunately, such cross-references are the exception rather than the rule in most classification schemes, this may well be a reflection of the fact that only in recent years have we begun to clarify the nature of relationships which may occur between concepts.

REFERENCES

Information Access Through The Subject : An Annotated Bibliography / by Salman Haider. - Online : OpenThesis, 2015. (408 pages ; 23 cm.)

Annotated bibliography titled Information Access Through The Subject covering Subject Indexing, Subject Cataloging, Classification, Artificial Intelligence, Expert Systems, and Subject Approaches in Bibliographic and Non-Bibliographic Databases etc. 

MLIS Thesis is available and discussed in following places: 
Information Access Through The Subject

The project "annotated bibliography" was worked out as Master of Library & Information Science (MLIS) dissertation in the Department of Library and Information Science, A.M.U, IndiaInformation Access Through The Subject is a very much appreciated work (see Testimonials). It earned the author S. Bashiruddin – P. N. Kaula Gold Medal, Post Graduate Merit Scholarship, First Division, and IInd Position in the MLIS program.

This article forms a part of Glossary of Library & Information Science.
Glossary of Library & Information Science


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ARTICLE HISTORY
  • Written 2017-03-18

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