根据一些重要的基础性概念，可以为基于SOA的企业体系结构的服务建立模型，并设计这些服务。
These are some of the essential foundational concepts on which the services in an SOA-based enterprise architecture are modeled and designed.
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.
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.
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