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<?xml version="1.0"?>
<article>
...
<fig id="fig005" position="float"><label>Fig. 5.</label><caption><p>fi
+fth</p></caption></fig>
<fig id="fig006" position="float"><label>Fig. 6.</label><caption><p>si
+xth</p></caption></fig>
</article>

use strict;
use XML::Twig;
...
}

$twig->print;

Correct Output: XPath Expression - "//fig//label"
---------------
...
<fig id="fig005" position="float"><caption><label>Fig. 5.</label><p>fi
+fth</p></caption></fig>
<fig id="fig006" position="float"><caption><label>Fig. 6.</label><p>si
+xth</p></caption></fig>
</article>

Wrong output:  XPath Expression - "//fig/label"
-------------
...
<fig id="fig005" position="float"><label>Fig. 5.</label><caption><p>fi
+fth</p></caption></fig>
<fig id="fig006" position="float"><label>Fig. 6.</label><caption><p>si
+xth</p></caption></fig>
</article>