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。
Not every tag is a simple symbol in the SXML structure; specifically, a namespace-qualified tag is a pair instead.
SXML结构中，每个标签并非都是简单的符号，特别地，命名空间限定的标签就有两个符号。
Often the response data contains an XML structure contained within a CDATA tag.
响应数据经常包含一个包含在 CDATA 标记中的 XML 结构。
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