Page 97 - DLIS405_INFORMATION_STORAGE_AND_RETRIEVAL

Information Storage and Retrieval

Notes 4. These also have found some application in subject indexes to library catalogues and the
shelf arrangement of book-stock. These are to be found in abstracting and indexing journals,
national bibliographies and indexes to journals.
5. In this single or multiple entry, present certain advantages at the search stage. It is possible
for a number of searches to be conducted simultaneously.

Limitations:

1. In pre-coordinate systems, the multidimensional character at the subject matter is forced
into a one-dimensional representations, which then necessitates to repeat the index entry in
someway for example by rotation of the terms.
2. In this system relationships among topics are built once and for all into the system vocabulary
or index entries formed from its components by the indexes. There are non manipulative.
3. A multiple access approach is possible, if we enter the document several times in the index
by duplicating the citation.
4. These are also criticized on the ground that even the extensive duplication of entries does
not provide the true multidimensional retrieval capability to multidimensional subject matter.
5. Efficient approaches to information retrieval demand such systems that permit the free
“combination” of classes and the terms representing them.
6. A number of ways have been suggested to provide multiple approach to retrieval in pre-
coordinate indexes without complete permulation of index terms.

9.8.2 Post-coordinate Indexing System

As the coordination of index terms is done after the index files has been compiled, this indexing
system is called post-coordinate indexing system.
Examples for post-coordinate indexing system:
• Uniterm system of Taube dates about 1951
• Peek- aboo by batter in England and cordonnier in France by 1940
• Edge- notched card system by calerin mooers.

Common Features

1. None of the entries in the system are specific. There are relatively large number of documents
under each heading and if the searches approaches the index as a conventional index, be in
liable to become involved in extensive scanning of entries in order to discriminate between
relevant and less relevant documents.
2. There are usually a larger number of entries in a post-coordinate indexing system than in an
index based upon pre-coordinate indexing principles.
3. The number of different heading is the index is relevant small, because, as in classification a
system scheme needless categories or heading than an equivalent enumerative scheme.

Conclusion

Thus in indexing it has pre and post-coordinated indexing system. There have some similarity and
dissimilarities. It can be summed up as follows:

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