Through the hierarchicalresearch 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。
2
Finally, point to the deficiency existing in the hierarchical learning technologies nowadays, which increase a new research task in the research of Robotic soccer.
最后，指出了当前机器人足球中分层学习技术存在的不足，为以后机器人足球研究又增加了一个新的研究课题。
3
While constructing domain knowledge base, ontology-based hierarchical categorization system of domain knowledge base is our main research topic.