     </p><p>
            If the command line input does not contain the indicated definition class (as self or as a parent), this method will return <span class="keyword"><span id="LST377DC1BD_0" data-languageSpecificText="cpp=nullptr|vb=Nothing|nu=null"></span></span>
            unless <span class="parameter">returnEmpty</span> is set to <span class="keyword"><span id="LST377DC1BD_1" data-languageSpecificText="vb=True|nu=true"></span></span>, in that case it will return an empty instance with default prop