type Ins = 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 Copy(_obj: Ins);override;

public

    // attributes property
    property Id read ReadXmlAttrId write WriteXmlAttrId;
    property Author read ReadXmlAttrAuthor write WriteXmlAttrAuthor;
    property Date read ReadXmlAttrDate write WriteXmlAttrDate;
    property W16duDateUtc read ReadXmlAttrW16duDateUtc write WriteXmlAttrW16duDateUtc;
    function ReadXmlAttrId();
    function WriteXmlAttrId(_value);
    function ReadXmlAttrAuthor();
    function WriteXmlAttrAuthor(_value);
    function ReadXmlAttrDate();
    function WriteXmlAttrDate(_value);
    function ReadXmlAttrW16duDateUtc();
    function WriteXmlAttrW16duDateUtc(_value);

    // multi property
    property Rs read ReadRs;
    function ReadRs(_index);
    function AddR(): R;
    function AppendR(): R;

public
    // Attributes
    XmlAttrId: OpenXmlAttribute;
    XmlAttrAuthor: OpenXmlAttribute;
    XmlAttrDate: OpenXmlAttribute;
    XmlAttrW16duDateUtc: OpenXmlAttribute;

    // Children

end;

function Ins.Create();overload;
begin
    {self.}Create(nil, "w", "gridCol");
end;

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

function Ins.Create(_parent: tslobj; _prefix: string; _local_name: string);overload;
begin
    setsysparam(pn_calcctrlword(), getsysparam(pn_calcctrlword()) .| 0x200);
    class(OpenXmlElement).Create(_parent, _prefix, _local_name);
end;

function Ins.Init();override;
begin
    pre := {self.}Prefix ? {self.}Prefix + ":" : "";
    attributes_ := array();
    attributes_pf_ := array(
        pre + "id": makeweakref(thisFunction(WriteXmlAttrId)),
        pre + "author": makeweakref(thisFunction(WriteXmlAttrAuthor)),
        pre + "date": makeweakref(thisFunction(WriteXmlAttrDate)),
        "w16du:dateUtc": makeweakref(thisFunction(WriteXmlAttrW16duDateUtc)),
    );
    sorted_child_ := array(
        pre + "r": array(0, makeweakref(thisFunction(AppendR))),
    );
    container_ := new TSOfficeContainer(sorted_child_);
end;

function Ins.Copy(_obj: Ins);override;
begin
    tslassigning_backup := tslassigning;
    tslassigning := 1;
    class(OpenXmlElement).Copy(_obj);
    if not ifnil(_obj.Id) then
        {self.}Id := _obj.Id;
    if not ifnil(_obj.Author) then
        {self.}Author := _obj.Author;
    if not ifnil(_obj.Date) then
        {self.}Date := _obj.Date;
    if not ifnil(_obj.W16duDateUtc) then
        {self.}W16duDateUtc := _obj.W16duDateUtc;
    tslassigning := tslassigning_backup;
end;

function Ins.ReadXmlAttrId();
begin
    return {self.}XmlAttrId.Value;
end;

function Ins.WriteXmlAttrId(_value);
begin
    if ifnil({self.}XmlAttrId) then
    begin
        {self.}XmlAttrId := new OpenXmlAttribute({self.}Prefix, "id", nil);
        attributes_[length(attributes_)] := {self.}XmlAttrId;
    end
    {self.}XmlAttrId.Value := _value;
end;

function Ins.ReadXmlAttrAuthor();
begin
    return {self.}XmlAttrAuthor.Value;
end;

function Ins.WriteXmlAttrAuthor(_value);
begin
    if ifnil({self.}XmlAttrAuthor) then
    begin
        {self.}XmlAttrAuthor := new OpenXmlAttribute({self.}Prefix, "author", nil);
        attributes_[length(attributes_)] := {self.}XmlAttrAuthor;
    end
    {self.}XmlAttrAuthor.Value := _value;
end;

function Ins.ReadXmlAttrDate();
begin
    return {self.}XmlAttrDate.Value;
end;

function Ins.WriteXmlAttrDate(_value);
begin
    if ifnil({self.}XmlAttrDate) then
    begin
        {self.}XmlAttrDate := new OpenXmlAttribute({self.}Prefix, "date", nil);
        attributes_[length(attributes_)] := {self.}XmlAttrDate;
    end
    {self.}XmlAttrDate.Value := _value;
end;

function Ins.ReadXmlAttrW16duDateUtc();
begin
    return {self.}XmlAttrW16duDateUtc.Value;
end;

function Ins.WriteXmlAttrW16duDateUtc(_value);
begin
    if ifnil({self.}XmlAttrW16duDateUtc) then
    begin
        {self.}XmlAttrW16duDateUtc := new OpenXmlAttribute("w16du", "dateUtc", nil);
        attributes_[length(attributes_)] := {self.}XmlAttrW16duDateUtc;
    end
    {self.}XmlAttrW16duDateUtc.Value := _value;
end;

function Ins.ReadRs(_index);
begin
    ind := ifnil(_index) ? -2 : _index;
    pre := {self.}Prefix ? {self.}Prefix + ":" : "";
    return container_.Get(pre + "r", ind);
end;

function Ins.AddR(): R;
begin
    obj := new R(self, {self.}Prefix, "r");
    container_.Insert(obj);
    return obj;
end;

function Ins.AppendR(): R;
begin
    obj := new R(self, {self.}Prefix, "r");
    container_.Append(obj);
    return obj;
end;