ExSL Expected Signal label 期望信号标识
EXSLT provides the exsl: document extension, which is supported by several of the more popular XSLT processors.
EXSLT提供了exsl： document扩展，得到了一些比较流行的XSLT处理程序的支持。
Exsl: node-set allows you to turn result tree fragments into node-sets so that you can apply XPath on them.
node - set允许您将结果树片段转换为节点集，这样便可以对其应用XPath。
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