chapter  2
8 Pages

On Integrating Data in the Internet Era

With the development of networking infrastructures came the need to exchange digital information across distributed organizations. While various efforts focused on standardizing the computer-to-computer exchange of structured messages, e.g. in the context of the Electronic Data Interchange EDI format,

(1) others tackled the difficult problem of relat-

ing heterogeneous data sources designed independently. Data integration aims at combining data residing at heterogeneous sources and providing the user with a unified view over those data.