type ExtLst = 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: ExtLst);override;
    function AddExt(): Ext;
    function AppendExt(): Ext;

    property Exts read ReadExts;
    function ReadExts(_index);

public
    //  Attributes

    // Children

end;

function ExtLst.Create();overload;
begin
    {self.}Create(nil, "a", "extLst");
end;

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

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

function ExtLst.Init();override;
begin

end;

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

function ExtLst.InitChildren();override;
begin
    child_elements_ := array(
    );
    sorted_child_ := array(
        "": -1,
    );
end;

function ExtLst.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 + "ext": obj := {self.}AppendExt();
            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 ExtLst.Copy(_obj: ExtLst);override;
begin

end;

function ExtLst.AddExt(): Ext;
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 = "ext" then break;
    end
    obj := new Ext(self, {self.}Prefix, "ext");
    {self.}InsertChild(obj, i+1);
    return obj;
end;

function ExtLst.AppendExt(): Ext;
begin
    obj := new Ext(self, {self.}Prefix, "ext");
    child_elements_[length(child_elements_)] := obj;
    return obj;
end;

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