Exchange Systems

Title: Exchange Systems

Research Question: How can we develop a framework for answering queries in peer-to-peer data exchange systems while maintaining consistency and respecting exchange constraints and trust relationships between peers?

Methodology: The researchers proposed a semantics for peer consistent answers (PCAs) in peer-to-peer data exchange systems. They considered two cases: the direct case, where transitive relationships between peers via exchange constraints (DECs) are not automatically considered, and the transitive case. They used database repair, which is a method of characterizing consistent answers to queries in single relational data bases with certain integrity constraints, to define PCAs. They also introduced a logic program specification to capture the different ways a system can stabilize after making DECs and trust relationship satisfactions.

Results: The researchers provided a precise semantics for peer consistent answers to first-order queries. They illustrated their approach with extended and representative examples, demonstrating how PCAs can be obtained through query rewriting and logic program specifications.

Implications: The framework developed by the researchers can be applied to peer-to-peer data exchange systems to ensure that answers to queries are consistent with both local semantic constraints and data exchange constraints with other peers. It also takes into account trust relationships between peers, which can influence the direction and extent of data exchange. This work contributes to the development of more efficient and reliable peer-to-peer data exchange systems.

Link to Article: https://arxiv.org/abs/0401015v1 Authors: arXiv ID: 0401015v1