Coordinating indexing

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In the same ordering indexing (engl. Coordinate indexing a document in) are indexing a plurality of descriptors unstructured and equally assigned.

For example, a document on lung cancer can be indexed with the descriptors “lung” and “cancer”, regardless of the order of the terms.

The method is based on a Boolean algebra in which the documents can be described as sets of atomic descriptors and retrieved using Boolean retrieval .

The co-ordinating indexing was essentially developed by Mortimer Taube at the beginning of the 1950s and, due to the simple automatic processing, became popular in information retrieval ( UNITERM system). Although indexing in the same order is less precise than syntactic indexing , it is still used frequently, for example in many social tagging systems.

Since the full-text indexing usually takes into account the frequency of terms in a document, this is not a synonym for indexing.


Export; Import; Italy; Germany; Wine; automobile

Problem: Because the relationships between the descriptors cannot be traced, the content of the document is unclear. The first part of the document can describe the export of cars to Italy and the second part the import of wine to Germany or vice versa. Syntactic indexing provides the solution to the problem .

See also


  • JC Costello Jr .: Uniterm indexing principles, problems and solutions . In: American Documentation . Volume 12, No. 1, pp. 20-26. doi : 10.1002 / asi.5090120105