Structured Graph Viewer: a scalable hypermedia browsing tool

When browsing a large hypermedia collection, users open struggle to maintain context. An overview facility which works together with standard browsers is needed. The Structured Graph Viewer is part of a system designed to do this. The system supports organising a collection as a structured graph, which can then be explored with the viewer. Structured graphs is a visual formalism originally created to assist the design of scalable graph based CASE tools. A structured graph includes: a graph, a hierarchy and a rule for graph summarisation which uses the hierarchy. The viewer offers improved navigation by letting users find nodes with a combination of: direct hyperlinks, summary hyperlinks, hierarchy based and text based search