Interested in how an efficient search engine works? Want to know what algorithms are used to rank resulting documents in response to user requests? The authors answer these and other key information retrieval design and implementation questions. This book is not yet another high level text. Instead, algorithms are thoroughly described, making this book ideally suited for both computer science students and practitioners who work on search-related applications. As stated in the foreword, this book provides a current, broad, and detailed overview of the field and is the only one that does so. Examples are used throughout to illustrate the algorithms. The authors explain how a query is ranked against a document collection using either a single or a combination of retrieval strategies, and how an assortment of utilities are integrated into the query processing scheme to improve these rankings. Methods for building and compressing text indexes, querying and retrieving documents in multiple languages, and using parallel or distributed processing to expedite the search are likewise described. This edition is a major expansion of the one published in 1998. Besides updating the entire book with current techniques, it includes new sections on language models, cross-language information retrieval, peer-to-peer processing, XML search, mediators, and duplicate document detection.

The public increase of interest in the past has not necessarily brought with it a greater understanding about how archives are formed. To this end, Richard Cox takes a serious look at archival repositories and collections. Cox suggests that archives do not just happen, but are consciously shaped (and sometimes distorted) by archivists, the creators of records, and other individuals and institutions. In this series of essays, Cox offers archivists rare insight into the fundamentals of appraisal, and historians and other users of archives the opportunity to appreciate the collections they all too often take for granted.