You can extend a global type definition by using the xs: extension element or restrict it by using the xs: restriction element.
您可以通过使用xs： extension元素扩展全局类型定义，也可以通过使用xs： restriction元素限制它。
Instead, the development environment supports the extension and definition of design-time behavior by classes such as designers that provide design-time support for components.
而是由开发环境依照提供元件设计阶段支援的类别(如设计工具)，支援设计阶段行为的扩充和定义。
Followed by detailed the definition and extension of thee-reference book at first, the paper sums up the different types and advantages of them by comparing to the traditional reference book.
首先对电子工具书的内涵与外延进行细致的界定，其次归纳出电子工具书的不同类型，再总结出电子工具书相比于传统纸质工具书有哪些特点与优势。
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