by Wesley W. Chu, Xiaohong Yang, Wenlei Mao
database systems have received increasing interest from both research
and industrial communities. However, trigger conditions in the active
rules are often difficult to specify, especially as the events and/or
conditions complexities increase. To remedy this problem, we propose an
active database system that supports rules with conceptual terms,
approximate operators, and complex events. The conceptual terms and
approximate operators are user and context sensitive. By introducing
these high level constucts, we not only simplify the rule specification
process, but also increase the rule expressiveness….- goto
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