The Stanford Digital Library Project is a comprehensive effort to enable a diverse and heterogeneous set of document-related services. It views search in digital libraries as a dialogical process. It generates site summaries in form of keyword - frequency tables that allow estimation of relevance for a given query.
LORE is a database management system for semi-structured data.
Instead mediators work independent of each other. Integrated sources are described using the KIF-language. DTDs are conceived as schema information for semistructured data. The query language is called XMAS and is closely related to the proposal XML-QL . The system can work according to the data warehousing approach or according to lazy mediation.