答：版本5技术预览并不用Web服务描述语言(Web Services Description Language, WSDL)文件表达安全性需求。

Answer: the Version 5 Tech Preview does not express security requirements in the Web Services Description Language (WSDL) files.

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它提供了两个不同抽象层次的描述语言以满足不同用户的需求。

This language provides two levels of abstraction to meet various user requirements.

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本文针对虚拟博物馆的特点及需求，给出一个基于XML的适于描述虚拟博物馆场景的场景描述语言xvm。

After analyzing the characteristics and requirements of virtual museum, this paper introduces an XML-based scene description language for virtual museum called XVM was introduced.

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