The data instance in Listing 7 is valid with this schema and its substitution group extensions.
清单7中的数据实例对这个模式及其替换群扩展是有效的。
Both functions require that the provided schema documents declare or define the instance element to be tested and the substitution group head element or the referenced type.
两个函数都要求提供的模式文档声明或定义要测试的实例元素，以及代替组head元素或引用类型。
The first instance of type substitution is in the fourth and fifth lines of the output, where the types of values in the ArrayList instances are specified.
类型替换的第一个实例在输出的第4和第5行，里面指定了ArrayList实例中值的类型。
It returns true if the element in the instance document is declared to be in the substitution group headed by the element identified by the element QName.
如果实例文档中的元素被声明为位于以元素QName指定的元素为首的代替组中，则返回true。
With complex type hierarchies in place, it's also possible to leverage substitution techniques in instance documents.
在构建好复杂类型层次结构之后，还可以在实例文档中使用替换技术。
With complex type hierarchies in place, it's also possible to leverage substitution techniques in instance documents.
在构建好复杂类型层次结构之后，还可以在实例文档中使用替换技术。
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