A Digital Library Model With Rich Semantic Structure

and collaborative work, the digital library model includes a public information space and private information spaces for individuals and work groups. Users have many tools to manage their private space, can search their private space separately or integrated with the public space, and are encouraged to contribute documents, annotations, and links. The information structure envisioned covers several object types (such as concepts, documents, projects, persons, organizations, and queries) and link types (such as deals with, defines, produces, includes, cites). It emphasizes concept hierarchies to guide exploration. The functions or tools envisioned are divided into search tools, especially a tool for browsing concept hierarchies, a search form for searching the system and external databases, thesaurus support for searching, and a glossary tool; document creation and editing tools, supporting collaborative authoring and annotation and link management; and document processing and link gen