public override DomainId <IAstNode> VisitNegationExpression(QlParser.NegationExpressionContext context)
        {
            var childExpression = Visit(context.booleanExpression())
                                  .To <IBooleanLogicNode>(m_domainItemLocator);

            return(m_astFactory.CreateNegationOperation(
                       context.GetText(),
                       childExpression));
        }