A while back we wrote about proper REST with json. While standard wise nothing much changed, implementation wise Spring came up with a HATEOAS implementation.
The implementation basically uses the common 'rel' and 'href' attributes that mimic the html 'link' attributes. That basically affirms our thoughts and we are happy with a pragmatic implementation to simplify our implementation.
Check out the details at https://github.com/SpringSource/spring-hateoas.