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 3:41:43 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
Compare the Mesopotamians views with that of Egyptians toward the world, afterlife, and the role of leaders in the society? show how this is reflected in the arts or religious symb

Three Levels of Description The three levels of description are detailed thus:  First Level of Description: For the first level of description the following elements are

Identification of Parts   In the light of what we have described so far let us identify the various areas of description and the data elements in the following entry. The areas

Controlled Indexing Language   In the foregoing paragraphs we have discussed the concept of an indexing language as also, the categories into which it falls. In the process, we

What are the two main elements which are included to understand informed consent?  Informed Consent is understood as including two main elements:   i. Knowledge [Subjects sh

State of the Art - Purpose and Presentation The State-of-the-Art Reports are of several types. They vary marginally in the presentation of the content. Though, their key purpo

Different types of integration, planning for integration in large and small groups, as well as possible activities for integration. Now we will focus on creating an environment for

discuss briefly the scientific and technical achievements of bronze age

Universal Bibliographic Control The bibliographic control of documents at the international level has always been a problem. Librarians have been concerned about this problem

Chinese History: China has an earliest history that stretches from 2200 B.C. to the recent. It currently has the largest population, the third biggest economic system, and possibly