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Text retrieval systems store a great variety of documents, from abstracts, newspaper articles, and Web pages to journal articles, books, court transcripts, and legislation. Collections of diverse types of documents expose shortcomings in current approaches to ranking. Use of short fragments of documents, called passages, instead of whole documents can overcome these shortcomings: passage ranking provides convenient units of text to return to the user, can avoid the difficulties of comparingdoi:10.1002/1532-2890(2000)9999:9999<::aid-asi1075>3.0.co;2-# fatcat:o6qu5isg5fbyfhosefngb7uwxy