TiVo USES a very simple form of meta-level knowledge, but even as the meta-level knowledge used becomes more and more complex, we should continue to keep control over adaptive behavior.
TiVo使用一种非常简单的元级别知识形式，但随着使用的元级别知识变得越来越复杂，我们应继续保持对自适应行为的控制。
Through the hierarchical research of workflow process model, it is put forward three levels of workflow process models: meta model level, model level and control model level.
对工作流过程模型进行分层研究，提出了三层架构的工作流过程模型：元模型层、模型层和控制模型层。
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