除了一步步遍历文档树查找元素外，Libxml2包含支持使用Xpath表达式取得指定结点集。完整的Xpath API文档在这里。Xpath允许通过路径文档搜索匹配指定条件的结点。-Using XPath requires setting up an xmlXPathContext and then supplying the XPath expression and the context to the xmlXPathEvalExpression

function.

The function returns an xmlXPathObjectPtr, which includes the set of nodes satisfying the XPath expression.