Validate object containing object for uniqueness

[ktn05]

Hi,

I have the example like below,

"obj2": 
{
    {
      "prop1": "baz", "prop2": 999
     },
    {
      "prop1": "qux", "prop2": 555
     }
 }

i.e object containing objects, now in this i need 'prop1' field to have unique values.

Note:: I know this is possible when it is array of object, but i dont think there is any solution for the same case when object containing objects.