XML data integration in SixP2P

Abstract

In the paper we discuss the problem of data integration in a P2P environment. In such setting each peer stores schema of its local data, mappings between the schema and schemas of some other peers (peer's partners), and schema constraints. The goal of the integration is to answer queries formulated against arbitrarily chosen peers. The answer consists of data stored in the queried peer as well as data of its direct and indirect partners. We focus on defining and using mappings, schema constraints, query propagation across the P2P system, and query reformulation in such scenario. A special attention is paid to discovering missing values using schema constraints and to reconcile inconsistent data using reliability levels assigning to the sources of data. The discussed approach has been implemented in SixP2P system (Semantic Integration of XML data in P2P environment).

XML Data Integration

“…• Peer-to-peer (P2P) systems. P2P systems leverage autonomous data sources (peers) as if they are part of a single unified data management system (Koloniari & Pitoura, 2005;Pankowski, 2008). Common usage of such systems includes a user initiating a query through one of the autonomous peer system, but getting answers from all relevant peers.…”

“…Moreover, it is self-describing in that XML instances carry the structure of the data in the form of human-readable tags that are associated with data elements; consequently XML data can be exchanged without associated schemas. This simplicity and flexibility led to XML's use in many different domains for which ease of data exchange is a primary requirement, these include peer-to-peer (P2P) applications (Pankowski, 2008), bioinformatics (Achard et al, 2001) and semantic web (Decker et al, 2000).…”

Semantic Data Mapping on E-Learning Usage Index Tool to Handle Heterogeneity of Data Representation

“…Implementation of data integration still has a many problems to be solved. Exchanging and merging data from loosely coupled, heterogeneous data representation and mapping data on different data sources are the serious problem for data integration [5][6][7][8][9][10][11]. A lot of application integrations are implemented in the current days.…”