Listing 2 shows a sample XML document, bib.xml, which represents a bibliography of books.
清单 2 显示了一个示例 XML 文档 bib.xml ，它表示书籍的书目。
The XML document is checked against a very restrictive schema.
该 XML 文档是由一个限制非常严格的模式进行检查的。
Note how the XML document types include the XML declaration.
请注意 XML 文档类型是如何包含 XML 声明。
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