type Comment = 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: Comment);override;
    function AddP(): P;
    function AppendP(): P;

    property Ps read ReadPs;
    function ReadPs(_index);

    property Author read ReadXmlAttrAuthor write WriteXmlAttrAuthor;
    property Date read ReadXmlAttrDate write WriteXmlAttrDate;
    property Id read ReadXmlAttrId write WriteXmlAttrId;
    function ReadXmlAttrAuthor();
    function WriteXmlAttrAuthor(_value);
    function ReadXmlAttrDate();
    function WriteXmlAttrDate(_value);
    function ReadXmlAttrId();
    function WriteXmlAttrId(_value);

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

    // Children

end;

function Comment.Create();overload;
begin
    self.Create(nil, "w", "comment");
end;

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

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

function Comment.Init();override;
begin
    self.XmlAttrAuthor := new OpenXmlAttribute(self.Prefix, "author", nil);
    self.XmlAttrDate := new OpenXmlAttribute(self.Prefix, "date", nil);
    self.XmlAttrId := new OpenXmlAttribute(self.Prefix, "id", nil);
end;

function Comment.InitAttributes();override;
begin
    attributes_ := array(
        self.XmlAttrAuthor,
        self.XmlAttrDate,
        self.XmlAttrId,
    );
end;

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

function Comment.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 + "p": obj := self.AppendP();
            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 Comment.Copy(_obj: Comment);override;
begin
    if not ifnil(_obj.XmlAttrAuthor.Value) then
        self.XmlAttrAuthor.Value := _obj.XmlAttrAuthor.Value;
    if not ifnil(_obj.XmlAttrDate.Value) then
        self.XmlAttrDate.Value := _obj.XmlAttrDate.Value;
    if not ifnil(_obj.XmlAttrId.Value) then
        self.XmlAttrId.Value := _obj.XmlAttrId.Value;
end;

function Comment.AddP(): P;
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 = "p" then break;
    end
    obj := new P(self, self.Prefix, "p");
    self.InsertChild(obj, i+1);
    return obj;
end;

function Comment.AppendP(): P;
begin
    obj := new P(self, self.Prefix, "p");
    child_elements_[length(child_elements_)] := obj;
    return obj;
end;

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

function Comment.ReadXmlAttrAuthor();
begin
    return self.XmlAttrAuthor.Value;
end;

function Comment.WriteXmlAttrAuthor(_value);
begin
    self.XmlAttrAuthor.Value := _value;
end;

function Comment.ReadXmlAttrDate();
begin
    return self.XmlAttrDate.Value;
end;

function Comment.WriteXmlAttrDate(_value);
begin
    self.XmlAttrDate.Value := _value;
end;

function Comment.ReadXmlAttrId();
begin
    return self.XmlAttrId.Value;
end;

function Comment.WriteXmlAttrId(_value);
begin
    self.XmlAttrId.Value := _value;
end;