In this landmark edition of the classic work, Taylor offers practitioners and students of library and information science a complete, up-to-date, and practical guide to the world of cataloging and classification as it stands at the beginning of the twenty-first century. The new edition emphasizes online catalogs and cataloging, with all the attendant terminology. Also included in the work are the 1998 revision of AACR2, MARC 21, the 21st edition of Dewey Decimal Classification, current schedules of the LC Classifications, the latest Library of Congress Subject Headings, and the 17th edition of Sears List of Subject Headings. In addition, Taylor addresses such vital issues as Internet cataloging, international access control, Natural Language Processing, and ontologies. The section of administrative issues has been completely rewritten and suggested readings have been updated in all chapters. A revised glossary provides clear definitions of the terminology needed to master this important field.