As for content, the img element is an empty element.
对内容来说，img是一个空元素。
This step ensures that even an empty element (one with no existing text node) is updated.
这一步确保即使是空元素(即不具有现有文本节点的元素)，也进行更新。
EndElement represents the element's closing tag (or simply the end of the element's markup, if it is an empty element).
EndElement表示元素的结束标记(或元素标记的结束，如果是空元素的话)。
For example, if you create two empty element nodes named "foo" without any attributes, they are equal, even though they are not identical.
例如，如果创建了两个没有任何属性的、名为“foo”的空元素节点，那么它们是相等的，但是它们不是相同的。
The next two queries cannot use an index because an element "phone408" needs to be returned for every author, even if it is an empty element for authors outside the 408 area code.
下面两个查询不能使用索引，因为必须为每个author返回元素“phone408”，即使是区号408之外的author的空元素。
The next two queries cannot use an index because an element "phone408" needs to be returned for every author, even if it is an empty element for authors outside the 408 area code.
下面两个查询不能使用索引，因为必须为每个author返回元素“phone408”，即使是区号408之外的author的空元素。
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