Peer Data Management Systems (Pdmss) are a novel, useful, but challenging paradigm for
distributed data management and query processing. Conventional integrated information
systems have a hierarchical structure with an integration component that manages a global
schema and distributes queries against this schema to the underlying data sources.
Pdmsare a natural extension to this architecture by allowing each participating system (peer)
to act both as a data source and as an integrator. Peers are interconnected by schema …