When the behavior of one or more key architectural elements is event-driven, modeling with State Diagrams can be especially useful in understanding that behavior.
当一个或多个关键架构要素的行为是事件驱动时，用状态图建模可以对理解该行为特别有用。
The conceptual modeling elements and mutual relations between them are discussed and some key technical problems are identified in the development of feature based temporal - spatial data models.
讨论了基于特征的概念模型要素及相互关系；提出了基于特征的时空数据模型所面临的关键技术。
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