internal AIMLTagHandler GetTagHandler(User user, SubQuery query, Request request, Result result, XmlNode node,
                                              AIMLTagHandler parentTagHandlerU)
        {
            AltBot         targetBot = user.bot;
            AIMLTagHandler tag       = targetBot.GetTagHandler(node, query, request, result, user, true);

            if (query != null)
            {
                query.CurrentTagHandlerU = tag;
            }
            if (query != null)
            {
                query.CurrentNode = node;
            }
            if (tag == null)
            {
                writeToLog("NULL TAG " + node.OuterXml);
            }
            if (tag != null)
            {
                tag.SetParent(parentTagHandlerU);
                if (query != null)
                {
                    query.LastTagHandlerU = parentTagHandlerU ?? tag;
                }
                TemplateInfo ti = tag.templateInfo;
                if (ti == null && query != null)
                {
                    ti = query.CurrentTemplate;
                }
                if (ti == null && parentTagHandlerU != null)
                {
                    ti = parentTagHandlerU.GetTemplateInfo();
                }
                if (ti != null)
                {
                    tag.templateInfo = ti;
                }
                else
                {
                    //    writeToLog("DEBUG9 Missing templateInfo " + node.OuterXml);
                }
            }
            return(tag);
        }
        /// <summary>
        /// Recursively evaluates the template nodes returned from the Proccessor
        /// </summary>
        /// <param name="node">the node to evaluate</param>
        /// <param name="query">the query that produced targetBot node</param>
        /// <param name="request">the request from the user</param>
        /// <param name="result">the result to be sent to the user</param>
        /// <param name="user">the user who originated the request</param>
        /// <returns>the output Unifiable</returns>
        public string processNodeVV(XmlNode node, SubQuery query,
                                    Request request, Result result, User user,
                                    AIMLTagHandler parentHandlerU, bool protectChild, bool copyParent,
                                    AIMLTagHandler tagHandlerU, out bool childSuccess)
        {
            AltBot TargetBot = tagHandlerU.bot;

            if (request != null)
            {
                TargetBot = request.TargetBot;
            }
            childSuccess = true;
            if (node == null)
            {
                string whyError = "ERROR null NODE " + tagHandlerU;
                writeToLog(whyError);
                throw new ChatSignalOverBudget(request, whyError);
            }
            if (node.NodeType == XmlNodeType.Text)
            {
                childSuccess = true;
                if (tagHandlerU != null)
                {
                    tagHandlerU.QueryHasSuceeded = true;
                }
                string s = StaticAIMLUtils.Trim(StaticAIMLUtils.TextNodeValue(node));
                if (!String.IsNullOrEmpty(s))
                {
                    return(StaticAIMLUtils.ValueText(s));
                }
                //return s;
            }
            if (tagHandlerU == null)
            {
                string whyError = "ERROR null THND " + node;
                childSuccess = false;
                writeToLog(whyError);
            }
            bool isTraced = (request != null && (request.IsTraced || !request.GraphsAcceptingUserInput)) ||
                            (query != null && query.IsTraced);

            // check for timeout (to avoid infinite loops)
            bool overBudget = false;

            if (request != null && request.IsComplete(result))
            {
                object gn = request.Graph;
                if (query != null)
                {
                    gn = query.Graph;
                }
                string s = StaticAIMLUtils.SafeFormat("WARNING! Request " + request.WhyComplete +
                                                      ". User: {0} raw input: {3} \"{1}\" processing {2} templates: \"{4}\"",
                                                      request.Requester.UserID, Unifiable.DescribeUnifiable(request.rawInput),
                                                      (query == null ? "-NOQUERY-" : query.Templates.Count.ToString()), gn, node);
                if (isTraced)
                {
                    request.writeToLog(s);
                }
                overBudget = true;
                if (!request.IsToplevelRequest)
                {
                    throw new ChatSignalOverBudget(request, s);
                }
            }


            // process the node
            if (ReferenceEquals(null, tagHandlerU))
            {
                childSuccess = true;
                if (node.NodeType == XmlNodeType.Comment)
                {
                    return(Unifiable.Empty);
                }
                if (node.NodeType == XmlNodeType.Text)
                {
                    string s = StaticAIMLUtils.Trim(StaticAIMLUtils.TextNodeValue(node));
                    if (String.IsNullOrEmpty(s))
                    {
                        return(Unifiable.Empty);
                    }
                    return(s);
                }
                // ReSharper disable ConditionIsAlwaysTrueOrFalse
                OutputDelegate del = (request != null) ? request.writeToLog : writeToLog;
                // ReSharper restore ConditionIsAlwaysTrueOrFalse
                if (overBudget)
                {
                    return(Unifiable.Empty);
                }
                string nodeInner = node.InnerXml;
                TargetBot.EvalAiml(node, request, del ?? TextPatternUtils.DEVNULL);
                return(node.InnerXml);
            }

            XmlNode oldNode         = node;
            bool    wasReadonlyNode = oldNode.IsReadOnly;

            // copy the node!?!
            if (protectChild)
            {
                copyParent = true;
                LineInfoElementImpl newnode = StaticAIMLUtils.CopyNode(node, copyParent);
                newnode.ReadOnly = false;
                node             = newnode;
            }

            if (overBudget)
            {
                tagHandlerU.Dispose();
                tagHandlerU  = null;
                childSuccess = true;
                return(Unifiable.Empty);
            }

            tagHandlerU.SetParent(parentHandlerU);
            //if (parent!=null) parent.AddChild(tagHandler);

            Unifiable cp = tagHandlerU.Transform();

            if (Unifiable.IsNullOrEmpty(cp) && (!tagHandlerU.QueryHasSuceeded || tagHandlerU.QueryHasFailed))
            {
                bool needsOneMoreTry = !request.SuspendSearchLimits &&
                                       (request.IsToplevelRequest /*|| result.ParentRequest.IsToplevelRequest*/);
                if (isTraced || needsOneMoreTry)
                {
                    //writeDebugLine("ERROR: Try Again since NULL " + tagHandler);
                    bool wsl = request.SuspendSearchLimits;
                    try
                    {
                        request.SuspendSearchLimits = true;
                        cp = tagHandlerU.Transform();
                        if (Unifiable.IsNull(cp))
                        {
                            childSuccess = false;
                            return(tagHandlerU.GetTemplateNodeInnerText());
                        }
                        if (false && Unifiable.IsNullOrEmpty(cp))
                        {
                            // trace the next line to see why
                            AIMLTagHandler handlerU = tagHandlerU;
                            TargetBot.TraceTest("ERROR: Try Again since NULL " + handlerU,
                                                () => { cp = handlerU.Transform(); });
                        }
                    }
                    finally
                    {
                        request.SuspendSearchLimits = wsl;
                    }
                }
            }
            if (tagHandlerU.QueryHasFailed)
            {
                childSuccess = false;
                return(tagHandlerU.FAIL);
            }
            childSuccess = !tagHandlerU.QueryHasFailed;
            if (!childSuccess)
            {
            }
            var st  = StaticAIMLUtils.IsSilentTag(node);
            var ine = Unifiable.IsNullOrEmpty(cp);

            if (!ine || st)
            {
                childSuccess = true;
                return(cp);
            }
            if (Unifiable.IsNull(cp))
            {
                cp = tagHandlerU.GetTemplateNodeInnerText();
                if (tagHandlerU.QueryHasSuceeded)
                {
                    childSuccess = true;
                    return(cp);
                }
                return(cp);
            }
            return(cp);
        }