请问delphi中的type自定义类型在什么地方定义，小弟我如何找不到

type
  TForm1 = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
  end;

type
  mytype=array of string;

var
  Form1: TForm1;

implementation

var v:mytype;
{$R *.dfm}