Subscription language: examples

• topic-based subscription

news.paris.louvre.exhibits

• content-based subscription

(type = news) & (location = paris) & (object = Louvre) & (event = exhibit) & (subject = agypte) & (date > 3/2001) & (price < 75FF)

• identify event patterns in single event stream

• correlate events in multiple streams

• validity of subscription (i.e., a lease)

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