如果子元素具有值，则 XPath 选择最后一个元素

Question

For example we have next XML file. Some orders have descriptions; some haven't. How I can take last order, that have DESCRIPTION element?

<ORDERSINFO>
  <ORDER>
    <NUMBER>168756</NUMBER>
  </ORDER>
  <ORDER>
    <NUMBER>16874</NUMBER>
    <DESCRIPTION>SOCKS</DESCRIPTION>
  </ORDER>
  <ORDER>
    <NUMBER>64971</NUMBER>
    <DESCRIPTION>JIGSAW</DESCRIPTION>
  </ORDER>
  <ORDER>
    <NUMBER>25597</NUMBER>
    <DESCRIPTION>FUEL CANISTER</DESCRIPTION>
  </ORDER>
  <ORDER>
    <NUMBER>31648</NUMBER>
  </ORDER>
</ORDERSINFO>

Answer 1

This XPath,

/ORDERSINFO/ORDER[DESCRIPTION][last()]

will select the last ORDER element that has a DESCRIPTION ,

<ORDER>
  <NUMBER>25597</NUMBER>
  <DESCRIPTION>FUEL CANISTER</DESCRIPTION>
</ORDER>

as requested.

---

If you wish to select the last DESCRIPTION that has content which is not empty or whitespace, use this XPath instead:

/ORDERSINFO/ORDER[DESCRIPTION[normalize-space()]][last()]