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In recent years, data streams have become ubiquitous as technology is improving and the prices of portable devices are falling, e.g., sensor networks, location-based services. Most data streams transmit only data tuples based on which continuous queries are evaluated. In this paper, the authors propose to enrich data streams with a new type of metadata called streaming tags or short tick-tags. The fundamental premise of tagging is that users can label data using uncontrolled vocabulary, and these tags can be exploited in a wide variety of applications, such as data exploration, data search, and to produce "Enriched" with additional semantics, thus more informative query results.
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