Managing and querying heterogenous and evolving data

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In recent years, modern information systems have evolved in fundamental ways. As opposed to the traditional client-server architecture of data warehouses, modern informations systems consists of large volumes of distributed data sources, all connected by the Internet. Aside from being distributed, the data sources are also evolving, with their schemas updated frequently and asynchronously. Today's information systems are also heterogeneous. Beyond traditional databases, there is an emergence of novel sources of data. They include real-time streamed data, data services, sensor and radio frequency identification (RFID) readings.