Infosphere project: System support for information flow applications

We describe the Infosphere project, which is building the systems software support for information-driven applications such as digital libraries and e lectronic commerce. The main technical contribution is the Infopipe abstrac tion to support information flow with quality of service. Using building bl ocks such as program specialization, software feedback, domain-specific lan guages, and personalized information filtering, the Infopipe software gener ates code and manages resources to provide the specified quality of service with support for composition and restructuring.