public override bool Process(Token t, HtmlTreeBuilder tb)
            {
                if (t.IsStartTag())
                {
                    Token.StartTag startTag = t.AsStartTag();
                    String name = startTag.Name();

                    if (StringUtil.In(name, "th", "td"))
                    {
                        tb.ClearStackToTableRowContext();
                        tb.Insert(startTag);
                        tb.Transition(InCell);
                        tb.InsertMarkerToFormattingElements();
                    }
                    else if (StringUtil.In(name, "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr"))
                    {
                        return HandleMissingTr(t, tb);
                    }
                    else
                    {
                        return AnythingElse(t, tb);
                    }
                }
                else if (t.IsEndTag())
                {
                    Token.EndTag endTag = t.AsEndTag();
                    string name = endTag.Name();

                    if (name.Equals("tr"))
                    {
                        if (!tb.InTableScope(name))
                        {
                            tb.Error(this); // frag
                            return false;
                        }
                        tb.ClearStackToTableRowContext();
                        tb.Pop(); // tr
                        tb.Transition(InTableBody);
                    }
                    else if (name.Equals("table"))
                    {
                        return HandleMissingTr(t, tb);
                    }
                    else if (StringUtil.In(name, "tbody", "tfoot", "thead"))
                    {
                        if (!tb.InTableScope(name))
                        {
                            tb.Error(this);
                            return false;
                        }
                        tb.Process(new Token.EndTag("tr"));
                        return tb.Process(t);
                    }
                    else if (StringUtil.In(name, "body", "caption", "col", "colgroup", "html", "td", "th"))
                    {
                        tb.Error(this);
                        return false;
                    }
                    else
                    {
                        return AnythingElse(t, tb);
                    }
                }
                else
                {
                    return AnythingElse(t, tb);
                }
                return true;
            }