title: check XML syntax with xmllint
body: <p>I am having a problem with some XML print files where the source system omits to convert some characters to their XML syntax equivalent (e.g. &amp; is not converted to <code>&amp;amp;</code>).</p>
  
  <p>Is there a way to catch this with xmllint? (I don't need to check the general tree structure using XSD).</p>