IDs are 64bit positive integers. If you allocate IDs for an entity called 'Sequence' you can use them for any other entity kind, including entities with parents which would otherwise use a unique range if auto allocated. IDs from 'Sequence' will be unique within your datastore, which is a superset of the requirement that IDs be unique per-entity group. However, you must always then use an ID from Sequence and never allow auto-allocation.
If some of your entities have parents you can't universally Kind.get_by_id(). -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
