Listing 26 shows how to read from external storage.
清单26展示了如何从外部存储器读取数据。
It doesn't read DTDs in external files, but it also doesn't use any declarations within the document (called the internal subset) for validation.
它不读取外部文件中的DTD，也不使用文档中的任何声明(称为内部子集)来进行检验。
If you have enabled validation, the value of this feature is ignored, in which case external DTD subsets are always read.
如果启用验证，该特性的值将被忽略，这种情况下总是会读入外部dtd子集。
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