随着应用规模的增长，我们逐步从根模块中重构出一些特性模块，来代表一组相关功能的集合。

As the app grows, we refactor the root module into feature modules that represent collections of related functionality.

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这是 2.0 中新增加的函数，也可用于测试本系列 第 3 部分 所述的三个可选特性模块：模式感知、 向后兼容 和序列化。

New for 2.0, this function can also test for all three optional feature modules described in Part 3 of this series: Schema Awareness, Backwards Compatibility, and Serialization.

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如果厂商实现了模式感知特性模块(请参阅本系列的第1和3部分)，XSLT处理程序就应该接受xsl： import - schema声明。

When a vendor implements the schema Awareness feature module (see Parts 1 and 3 of this series), the XSLT processor will accept the XSL: import-schema declaration.

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