internal override void Accept(IASTVisitor visitor)
 {
     visitor.VisitEnter(this);
       foreach (var item in _preItems)
     item.Accept(visitor);
       visitor.VisitRenderBody(this);
       foreach (var item in _postItems)
     item.Accept(visitor);
       visitor.VisitLeave(this);
 }

 internal abstract override void Accept(IASTVisitor visitor, params object[] args);

 public abstract bool AcceptVisitor(IASTVisitor visitor);

 public override bool AcceptVisitor(IASTVisitor visitor)
 {
     throw new NotImplementedException();
 }

 internal override void Accept(IASTVisitor visitor, params object[] args)
 {
     visitor.Visit(this, args);
 }

		public virtual bool Accept(IASTVisitor visitor)
		{
			throw new NotImplementedException( this.GetType().FullName + " must implement Accept" );
		}

 public static void StartVisiting(IASTVisitor visitor, TreeNode<IASTNode> rootNode)
 {
     rootNode.Data.Accept(visitor);
     rootNode.Children.ForEach(child => StartVisiting(visitor, child));
 }

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitCompilationUnit(this);
			return true;
		}

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitExpressionStatement(this);
			return true;
		}

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitOpaqueIdentifier(this);
			return true;
		}

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitMethodInvocationExpression(this);
			return true;
		}

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitSourceUnit(this);
			return true;
		}

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitBlockExpression(this);

			return true;
		}

 public object AcceptChildren(IASTVisitor visitor, object data)
 {
     foreach (INode child in children) {
         if (child != null) {
             child.AcceptVisitor(visitor, data);
         }
     }
     return data;
 }

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitMemberAccessExpression(this);
			return true;
		}

 public virtual object AcceptVisitor(IASTVisitor visitor, object data)
 {
     return visitor.Visit(this, data);
 }

		public bool Accept(IASTVisitor visitor)
		{
			visitor.VisitTypeReference(this);

			return true;
		}

 public void Accept(IASTVisitor visitor)
 {
     visitor.Visit(this);
 }

		public override bool Accept(IASTVisitor visitor)
		{
			visitor.VisitParameterVarIdentifier(this);

			return true;
		}

 public override bool AcceptVisitor(IASTVisitor visitor)
 {
     return visitor.VisitNode(this);
 }