func guestbookKey(ctx context.Context) *datastore.Key {
	// The string "default_guestbook" here could be varied to have multiple guestbooks.
	return datastore.NewKey(ctx, "Guestbook", "default_guestbook", 0, nil)
}
func guestbookKey(ctx context.Context) *datastore.Key {
	
	return datastore.NewKey(ctx, "Guestbook", "default_guestbook", 0, nil)
}
func guestbookKey ( ctx context . Context ) * datastore . Key { // The string "default_guestbook" here could be varied to have multiple guestbooks. return datastore . NewKey ( ctx , " " , " " , 0 , nil ) }
// guestbookKey returns the key used for all guestbook entries.
guestbookKey returns the key used for all guestbook entries .