XSLT transforms an XML source tree into an XML or XML-type result tree.
XSLT将xml源树转换成xml或者xml类型的结果树。
Result tree fragments (RTF) -which are sometimes unavoidable-are strings.
结果树片段(Result tree fragment, RTF)—有时是不可避免的—是字符串。
If they are defined on an LRE, then they are copied to the result tree.
如果定义在LRE上则被复制到结果树中。
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