Differentiate between pre-coordinate and post- coordinate indexing

Pre-coordinate and post-coordinate indexing are two approaches used in information processing and retrieval systems, each with its unique characteristics.

Pre-coordinate indexing involves assigning index terms to documents before the documents are created or processed. In this approach, the indexer decides on the appropriate index terms that represent the content of the document. This indexing method is rigid and ________ __________ __________ ___ __________ ___ _____ ___.
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