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xmlxpathxmllint

xpath conditionals not working with xmllint

I am trying to use a conditional to filter some nodes of the following XML using xpath.

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!DOCTYPE html>
<html>
<body>
<div class="video_wrapper">
  <div class="stretchy-wrapper">
    <video width="1280px" height="720px">
      <source src="video-480p.mp4" type="video/mp4" label="480P" res="480"/>
      <source src="video-720p.mp4" type="video/mp4" label="720P" res="720"/>
      <source src="video.mp4" type="video/mp4" label="1080P" res="1080"/> 
    </video>
  </div>
</div>
</body>
</html>

This XPath works:

xmllint --xpath "//source" ./scratch.xml
<source src="video-480p.mp4" type="video/mp4" label="480P" res="480"/>
<source src="video-720p.mp4" type="video/mp4" label="720P" res="720"/>
<source src="video.mp4" type="video/mp4" label="1080P" res="1080"/>

However this does not:

xmllint --xpath "//source[@res='1000']" ./scratch.xml
XPath set is empty

Is my syntax somehow wrong?

P.S. The version of libxml on my system is 20904

Solution

  • //source[@res='1000'] selects nothing because your document has no such source element.

    Perhaps you meant

    //source[@res='1080']
                 ^

    which selects

    <source src="video.mp4" type="video/mp4" label="1080P" res="1080"/>