Includes bibliographical references and index.; Orientation : the world of digital libraries -- People in digital libraries -- Presentation : user interfaces -- Textual documents: the raw material -- Multimedia : more raw material -- Metadata : elements of organization -- Interoperability : protocols and services -- Internationalization : the global challenge -- Visions : future, past, and present -- Greenstone digital library software. Building collections -- Operating and interoperating -- Design patterns for advanced user interfaces.;