Abstract
The World Wide Web (WWW) currently evolves into a Web of Linked Data where content providers publish and link their data as they have done with hypertext for the last 20 years. We understand this emerging dataspace as a huge, distributed database which is -at best- partially known to query execution systems. To tap the full potential of the Web, such a system must be able to answer a query using data from initially unknown data sources. For this purpose, traditional query execution paradigms are unsuitable because those assume a fixed set of potentially relevant data sources beforehand.
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