V3增加了对所有核心数据类型的数字签名的支持以处理数据集成和可靠性问题，这个功能以前在UDDI中是没有的。

V3 adds support for digital signing of all core data types to address issues of data integrity and authenticity not previously available in UDDI.

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XPath 2.0[开发中]增加了新的特性，包括对W3C XML Schema(后面将讨论)的支持和许多新的核心功能。

XPath 2.0 [in development] adds many new features, including support for W3C XML Schema (to be covered) and many new core functions.

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为了克服这个问题和增加新特性，Axis2 引入了 Web 服务扩展或模块的概念；其中模块的主要工作是对核心功能进行扩展。

To overcome this problem , and to add new features, Axis2 introduces the concept of Web service extensions or a module, where the main job of a module is to extend core functionality.

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