topics they represent An index is said to be specific if the indexer uses parallel descriptors to the concept of the document and reflects the concepts precisely. Specificity tends to increase with exhaustivity as the more terms you include, the narrower those terms will be.

Indexing theory

Hjørland (2011) found that theories of indexing are at the deepest level connected to different theories of knowledge:

* Rationalist theories of indexing (such as Ranganathan's theory)

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