html head title
html head title-
The publish operation could be achieved by pointing to the title element with the xpath expression / html / head / title .
发布操作可以通过指向xpath表达式为/html/head/title的标题元素来完成。
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It is quite natural to write XPath expressions like / html / head / title , but such expressions return an empty node set , because the input document contains no elements like title .
比较常见的情况是编写/html/head/title这样的XPath表达式，但是这类表达式会返回一个空的节点集，因为输入文档不会包含title这样的元素。