值得仔细查看一下文档类型声明的内容。
The document type declaration contents are worth looking at in detail.
此外，XML还支持不同类型的文本编码，让内容作者在文档中声明使用的编码。
In addition, XML also provides support for various types of text encoding, leaving it up to the content author to declare the encoding they're using in each document.
在XML Schema 1.0中，一个复杂类型所允许的子元素序列完全由它的内容模型—组织在、和模型组中的元素声明和通配符确定。
In XML Schema 1.0, the sequence of sub-elements allowed by a complex type is completely determined by its content model-element declarations and wildcards organized in, and model groups.
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