RESTful retrieval of entities

Hi all,

Most sample implementations are based upon JPA entity retrieval using JPA's entity manager.

How would one go about entity retrieve via REST, i.e. a webapp retrieving, displaying and updating data it does not "own" and cannot access via a db, e.g. airline ticket bookings retrieved via REST.

Is there something like an implementation of a REST-Entity Manager, wrapping all RestTemplate actions, or some sort of REST-Dao?

Any input would be much appreciated.

Thanks,
Thomas