What makes this example extensible is that the schema developer only has to add a new element declaration indicating that it is a member of the substitution group.
这个示例的扩展点是模式开发人员必须添加一个新的元素声明来表明它是替换群的一个成员。
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The solution is extensible both to new kinds of clients and to new kinds of result collectors and what interactions there are have been localized to the TestContext class and its subtypes.
They talk about what technology to use for the POC, whatExtensible Markup Language (XML) standards to use, what platforms to use, what ESB to use, and so on.