<!-- XML files can start with a comment but then must not contain processing instructions.
         This should be rare so we assign lower priority here. Priority is also lower than text/html magics
         for them to be preferred for HTML starting with comment.-->
    <magic priority="30">
      <match value="&lt;!--" type="string" offset="0"/>
    </magic>
    <glob pattern="*.xml"/>
    <glob pattern="*.xsl"/>