type FldSimple = 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: FldSimple);override;

public

    // attributes property
    property Instr read ReadXmlAttrInstr write WriteXmlAttrInstr;
    function ReadXmlAttrInstr();
    function WriteXmlAttrInstr(_value);

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

public
    // Attributes
    XmlAttrInstr: OpenXmlAttribute;

    // Children

end;

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

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

function FldSimple.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 FldSimple.Init();override;
begin
    pre := {self.}Prefix ? {self.}Prefix + ":" : "";
    attributes_ := array();
    attributes_pf_ := array(
        pre + "instr": makeweakref(thisFunction(WriteXmlAttrInstr)),
    );
    sorted_child_ := array(
        pre + "r": array(0, makeweakref(thisFunction(AppendR))),
    );
    container_ := new TSOfficeContainer(sorted_child_);
end;

function FldSimple.Copy(_obj: FldSimple);override;
begin
    tslassigning_backup := tslassigning;
    tslassigning := 1;
    class(OpenXmlElement).Copy(_obj);
    if not ifnil(_obj.Instr) then
        {self.}Instr := _obj.Instr;
    tslassigning := tslassigning_backup;
end;

function FldSimple.ReadXmlAttrInstr();
begin
    return {self.}XmlAttrInstr.Value;
end;

function FldSimple.WriteXmlAttrInstr(_value);
begin
    if ifnil({self.}XmlAttrInstr) then
    begin
        {self.}XmlAttrInstr := new OpenXmlAttribute({self.}Prefix, "instr", nil);
        attributes_[length(attributes_)] := {self.}XmlAttrInstr;
    end
    {self.}XmlAttrInstr.Value := _value;
end;

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

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

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