Empty elements are converted to start-end tag pairs.
将空的元素转化成起始-结束标签对。
writes the content (the text between the start and end tag in an XML file) for the one node described by its node attribute.
——写入node 属性描述的一个节点的内容（XML文件中开始和结束标记之间的文本）。
Since any given element is contained within the start and end tag of its containing element, the structure has to form a tree.
由于任何给定元素都包含在包容它的元素的开始与结束标记之内，因此该结构必然为树型。
Attributes contribute to somewhat shorter XML because they have only a single tag as opposed to elements with a start tag and an end tag.
属性有助于使XML变得更短，因为属性只需一个标记，而元素则需要一对开始标记和结束标记。
If you fail to include an end tag for each start tag, your XML document is not well-formed, and parsers will not parse the document properly.
如果缺少结束标记，XML文档就不是结构良好的，解析器就不能正确地解析文档。
This could occur in a mixed content model, or when an element end tag is read.
这可能发生于混合内容模型或读取项目结尾标记时。
This could occur in a mixed content model, or when an element end tag is read.
这可能发生于混合内容模型或读取项目结尾标记时。
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