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systems store only a representation of the document or query which means that the text of a document is lost once it has been processed for the purpose of generating its representation
...When the retrieval system is on line,it is possible for the user to change his request during one search session in the light of a sample retrieval,thereby,it is hoped,improving the subsequent retrieval run
...Secondly,the processor,that part of the retrieval system concerned with the retrieval process
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