Search |  Contact |  SRI Home Do not follow this link, or your host will be blocked from this site. This is a spider trap. Do not follow this link, or your host will be blocked from this site. This is a spider trap. Do not follow this link, or your host will be blocked from this site. This is a spider trap.A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ASRI International.  333 Ravenswood Avenue.  Menlo Park, CA 94025-3493. SRI International is a nonprofit corporation.

AIC Seminar Series

Semantic Data Sharing with a Peer Data Management System

Igor TatarinovUniversity of Washington at Seattle[Home Page]

Date:  2004-03-25 at 10:00

Location:  EJ228  (Directions)

   Abstract

Data sharing is a ubiquitous problem. Large enterprises, governments, research communities, and people with common interests are interested in making their data available as well as accessing others' data. The World Wide Web (WWW) and Peer-to-Peer (P2P) networks have been quite successful in providing an easy way for users to share their data. A serious limitation of these approaches is that they support keyword queries only, rather than much richer database-style queries that are important for many kinds of data sharing applications. Database-style queries require that data have structure (semantics) whereas Web and P2P data is essentially text. Data Integration and Data Warehousing are known database technologies that enable semantic data sharing. These technologies are rather heavyweight, however. They impose a centralized mediator schema, which impedes schema evolution and complicates the data sharing process. In this talk, I will desribe Peer Data Management, a novel approach to semantic data sharing. In a Peer Data Management System (PDMS), a peer is associated with a schema that represents the peer's "view of the world". Every peer defines semantic mappings to a few other peers. The resulting semantic network enables querying over the entire shared data using the user's local schema. The PDMS takes care of reformulating (translating) the user query over the query peer into queries over other peers. I will describe an algorithm for query reformulation in a PDMS and a number of optimization techniques that significantly improve the scalability of the algorithm.

   Note for Visitors to SRI

Please arrive at least 10 minutes early as you will need to sign in by following instructions by the lobby phone at Building E. SRI is located at 333 Ravenswood Avenue in Menlo Park. Visitors may park in the parking lots off Fourth Street. Detailed directions to SRI, as well as maps, are available from the Visiting AIC web page. There are two entrances to SRI International located on Ravenswood Ave. Please check the Builing E entrance signage.

SRI International
©2014 SRI International 333 Ravenswood Avenue, Menlo Park, CA 94025-3493
SRI International is an independent, nonprofit corporation. Privacy policy