An important component of XLibris is its automatic source and data selection facilities. Section 7 summarizes and concludes. Distributed Information Retrieval 129 2. Environments containing many databases, and in which database contents may change often, encourage the use of resource descriptions that can be created automatically.
Environments containing heterogeneous databases also favor detailed resource descriptions.
An experimental comparison of the effectiveness of computers and humans as search intermediaries . Some commercial services group databases into sets with common themes, for example newspaper collections or appellate court decisions. Database grouping is an effective solution for information needs or information access patterns that can be anticipated. When information needs are diverse, content based database selection is a more effective solution. An experimental comparison of the effectiveness of computers and humans as search intermediaries .