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use strict;
use XML::Checker::Parser;
...
  die XML::Checker::error_message ($code, @_) if $code < 300;
}

<?xml version="1.0" encoding="utf-8"?>
<series>
...
</article>
</series>

XML::Checker ERROR-101: undefined ELEMENT [series]
...
        Context: line 6, column 13, byte 239
data.xml passed validation