type Tbl = class(OpenXmlElement)
public
    function Create();overload;
    function Create(_node: XmlNode);overload;
    function Create(_parent: tslobj; _prefix: string; _local_name: string);overload;
    function Init();override;
    function InitAttributes();override;
    function InitChildren();override;
    function InitNode(_node: XmlNode);override;
    function Copy(_obj: Tbl);override;
    function AddTr(): Tr;
    function AppendTr(): Tr;

    property Trs read ReadTrs;
    function ReadTrs(_index);

public
    //  Attributes

    // Children
    TblPr: TblPr;
    TblGrid: TblGrid;

end;

function Tbl.Create();overload;
begin
    self.Create(nil, "w", "tbl");
end;

function Tbl.Create(_node: XmlNode);overload;
begin
    class(OpenXmlElement).Create(_node: XmlNode);
end;

function Tbl.Create(_parent: tslobj; _prefix: string; _local_name: string);overload;
begin
    class(OpenXmlElement).Create(_parent, _prefix, _local_name);
end;

function Tbl.Init();override;
begin
    self.TblPr := new TblPr(self, self.Prefix, "tblPr");
    self.TblGrid := new TblGrid(self, self.Prefix, "tblGrid");
end;

function Tbl.InitAttributes();override;
begin
    attributes_ := array(
    );
end;

function Tbl.InitChildren();override;
begin
    child_elements_ := array(
        0: self.TblPr,
        1: self.TblGrid,
    );
    sorted_child_ := array(
        "": -1,
        self.TblPr.ElementName: 0,
        self.TblGrid.ElementName: 1,
    );
end;

function Tbl.InitNode(_node: XmlNode);override;
begin
    if ifObj(self.XmlNode) then
        for k,v in child_elements_ do v.InitNode(nil);
    self.XmlNode := ifObj(_node) ? _node : nil;
    node := ifObj(_node) ? _node.FirstChild() : nil;
    flag := false;
    if ifnil(child_elements_[0]) and length(child_elements_) > 0 then
    begin
        flag := true;
        arr := child_elements_;
        child_elements_ := array();
    end
    pre := ifString(self.Prefix) ? self.Prefix + ":" : "";
    while ifObj(node) do
    begin
        node_name := node.GetName();
        pos := sorted_child_[node_name];
        if ifnil(pos) or pos = -1 then
        begin
            obj := nil;
            case node_name of
                pre + "tr": obj := self.AppendTr();
            end;
            if ifObj(obj) then obj.InitNode(node);
        end
        else if flag then
        begin
            obj := arr[pos];
            obj.InitNode(node);
            child_elements_[length(child_elements_)] := obj;
        end
        else begin
            child_elements_[pos].InitNode(node);
        end
        node := node.NextElement();
    end
end;

function Tbl.Copy(_obj: Tbl);override;
begin
    self.TblPr.Copy(_obj.TblPr);
    self.TblGrid.Copy(_obj.TblGrid);
end;

function Tbl.AddTr(): Tr;
begin
    len := length(child_elements_);
    if len = 0 then i := -1;
    else begin
        for i:=len-1 downto 0 do
            if child_elements_[i].LocalName = "tr" then break;
    end
    obj := new Tr(self, self.Prefix, "tr");
    self.InsertChild(obj, i+1);
    return obj;
end;

function Tbl.AppendTr(): Tr;
begin
    obj := new Tr(self, self.Prefix, "tr");
    child_elements_[length(child_elements_)] := obj;
    return obj;
end;

function Tbl.ReadTrs(_index);
begin
    ind := ifnil(_index) ? -2 : _index;
    arr := array();
    for k,v in child_elements_ do
    begin
        if v.LocalName = "tr" then
        begin
            arr[length(arr)] := v;
            ind--;
        end;
        if ind = -1 then return v;
    end;
    return arr;
end;