IBM SystemT
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IBM SystemT is a declarative information extraction system built as a research project at IBM's IBM Almaden Research Center beginning in 2005.
It includes the following main components: (1) AQL, a declarative rule language with similar syntax as SQL; (2) Optimizer, which takes AQL statements as input and generates high-performance algebraic execution plans; and (3) Execute engine, which execute the plan generated by the Optimizer.