상속: INotifyPropertyChanging, INotifyPropertyChanged
 partial void DeleteStructure(Structure instance);
 partial void UpdateStructure(Structure instance);
		private void detach_Structures(Structure entity)
		{
			this.SendPropertyChanging();
			entity.Line = null;
		}
 partial void InsertStructure(Structure instance);
		private void attach_Structures(Structure entity)
		{
			this.SendPropertyChanging();
			entity.Line = this;
		}