The Piazza peer data management system

摘要: Intuitively, data management and integration tools are well-suited for exchanging information in a semantically meaningful way. Unfortunately, they suffer from two significant problems: They typically require comprehensive schema design before can be used to store or share difficult extend because evolution is heavyweight may break backward compatibility. As result, many small-scale sharing tasks more easily facilitated by nondatabase-oriented that have little support semantics. The goal of the peer system (PDMS) address this need: We propose use decentralized, extensible architecture which any user contribute new data, information, even mappings between other peers' schemes. PDMSs represent natural step beyond systems, replacing their single logical with an interlinked collection semantic individual schemas. This paper describes-several aspects Piazza PDMS, including mediation formalism, query answering optimization algorithms, relevance Web.