直接使用rtf，不用管隐含文档节点(IDN)。
Just use the RTF, now known as an Implied Document Node (IDN), directly.
另一方面的局限与从 xsl:variable 内容中调用命名模板时的结果树片段有关（参阅上一节 隐含文档节点）。
Another restriction is the limitation involved in result tree fragments when calling a named template from the content of xsl:variable. (See the earlier section, Implicit document nodes).
后一种形式建立了 2.0 中的隐含文档节点（Implicit Document Node，IDN），这是一种新增加的临时树 结构。
That latter form creates an Implicit Document Node (IDN) in 2.0, which is one form of the new temporary tree structure.
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