evaluate (xpath context &optional unordered-p)
the result of evaluating xpath within the context
Evaluates an XPath expression
xpath can be a string, a sexpr-based XPath epression or a compiled expression. The context can be obtained using make-context. As an alternative, a node can be specifed.
If unordered-p is false (default) and value being returned is a node-set, it will be sorted using sort-node-set so its nodes will be in document order. If unordered-p is true, the order of the nodes is unspecified. Unordered mode can be significantly faster in some cases (and never slower).