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