Post-coordinate indexing model, Humanities

POST-COORDINATE INDEXING MODEL 

All the pre-coordinate indexing models discussed so far are of unidimensional in nature based on the order of significance. The significance order is again based on the syntactical rules of the given pre-coordinate  indexing model. Rigidity of significance order may not meet the approaches of all users with a particular pattern of coordination, even with permutations. Therefore, the need was felt for a multidimensional system to permit access to subjects from any point of view. The alternative naturally was to prepare an index, where the subject concepts will be  kept separately  uncoordinated by the indexer. Coordination of concepts could be done  at the time  of search. It should be  noted that the process of coordination of concepts exists in both the pre-and post-coordinate indexing models, but it is done at two different stages. The indexing system which has the ability to freely coordinate terms  at the  time of search, thereby providing an unlimited number of access points to a document belongs to the post-coordinate or coordinate indexing models. 

Broadly, there are two types of post-coordinate indexing systems -Term Entry System and Item Entry System. In the Term Entry System, index entries are made for a document under each of the appropriate terms and are arranged in alphabetical sequence. A card catalogue using unit cards is of this kind. In this system, the number of index entries for a document is dependent on the number of terms representing the content of the document. Here terms are posted on the item. Uniterm Indexing and Optical Coincidence Card are examples of Term Entry System. Item Entry System takes the opposite approach and makes a single index entry for each document, using a physical form which permits access to the entry from all appropriate terms. Here, items are posted on the term. Edge-Notched Card or Punched Card System is the best example of item entry system. 

Most important features of the post-coordinate indexing system  are : (a) No  sequence of terms or citation order is necessary. Every term gets equal weight; (b) constituent concepts of a composite subject are kept separately uncoordinated by the indexer and the coordination of concepts is done by the searcher at the search stage; (c) The searcher has wide options of the free manipulation of the classes at the time of searching. As a result, the searcher has the complete freedom to coordinate the index terms in any combination or order required; (d) Multidimensionality in relationships of concepts can be retained. 

Post-coordinate indexing system was first conceived by Mortimer Taube in 1953 as a means of organising the research reports acquired by the US Armed Services Technical Information Agency. This indexing system became  very  popular due to its simplicity. Taube's system was based upon "uniterm cards", a card-based system. The principles of this system have been adapted and further evolved in computer-based bibliographic information retrieval systems. When Taube conceived the system, it was based on unit term. Soon he changed the idea of unit term to unit concept.  

Posted Date: 10/26/2012 3:41:42 AM | Location : United States







Related Discussions:- Post-coordinate indexing model, Assignment Help, Ask Question on Post-coordinate indexing model, Get Answer, Expert's Help, Post-coordinate indexing model Discussions

Write discussion on Post-coordinate indexing model
Your posts are moderated
Related Questions
Functions of a Thesaurus   The major functions of a thesaurus include the following :  a) it provides a standard vocabulary for a given subject field by exercising control o

Name and describe the three technological revolutions that define human history.  Use concrete examples of specific technologies to support your answer

"He who has left the household life is a lodger beyond the earthly [secular] world , and his ways are cut off from those of other beings. The doctrine by which he lives enables

complete internet search for a woman who made significant contributions to the renaissance or baroque era (for example sophonisba, Anguissola or Artemisia Gentileschi)

Machine-readable Record Format   MARC  is an acronym  for Machine-readable Catalogue or cataloguing. This general description is misleading, implying that MARC is a kind of cat

what are the main determinants of poverty?

What role does Plunkitt see for political party bosses to play within the Democratic Party? Why does he feel that way?

Special features Some general and subject dictionaries include some encyclopaedic features in dictionary. They add to the value of a dictionary as it becomes a convenient rea

Needs At present the number of research journals published in the world is or 130,000 according to Ulrich's International Periodicals' Directory. The number of articles publi

Format The physical format of the dictionary should be compatible with efficient use. Size, binding, paper, print and appearance should be examined carefully while evaluating