该扩展视图在左边，以树状图的形式，显示出计划的各种组件，在右边显示与每一项选中事件相关的细节信息。
The expanded view shows the various artifacts of the schedule as a tree view on the left, with detailed information related to each selected event on the right.
第二章介绍了虚拟现实建模语言VRML的核心原理和体系结构，并对VRML中的一些重要概念如节点、场景图结构、事件体系、扩展机制等作了详细介绍。
Chapter 2 introduce the principle and system architecture of VRML, especially focus on the important concepts, such as node, scene graph structure, event system and extended mechanism.
重点讨论了UML活动图的扩展、事件驱动机制的模型描述和数据传递机制的模型描述。
The discussion focuses on UML activity diagram extension, model description of event-driven mechanism and data-transfer mechanism.
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