如何使用XPath选择末尾空节点？

To target only the empty <node> elements that come after the last non-empty <node> in your <bar> container (ignoring earlier empty nodes), you can use these XPath expressions tailored to your definition of "empty" (no text content, including descendants):

Key XPath Expressions #

1. Select all trailing empty nodes #

This expression picks every empty <node> where there are no non-empty <node> elements following it:

//bar/node[string-length(.) = 0 and not(following-sibling::node[string-length(.) > 0])]

2. Alternative: Target after the last non-empty node #

First, locate the last non-empty <node>, then select all empty siblings that come after it:

//bar/node[string-length(.) > 0][last()]/following-sibling::node[string-length(.) = 0]

Breakdown of the Logic #

Let’s map this to your example:

blah blah blah blah blah blah

• string-length(.) = 0: Checks if the node (and all its descendants) have no text content. This includes both empty <node></node> and nested empty nodes like <node><node></node></node>.
• not(following-sibling::node[string-length(.) > 0]): Ensures there are no non-empty <node> elements after the current node—so it’s part of the trailing empty sequence.

Adjusting for Strictly Empty Nodes (No Child Nodes) #

If you only want nodes with no child elements or text (i.e., exclude <node><node></node></node>), modify the condition to check for zero child nodes and empty text:

//bar/node[count(node()) = 0 and string-length(text()) = 0 and not(following-sibling::node[string-length(.) > 0])]

内容的提问来源于stack exchange，提问作者Sam