// Load this into module foobar
// Then ask these queries:

//              john[name->?N]@foobar.
//    	      	john[age->?A]@foobar.
//              john[salary->?S]@foobar.
//    	      	delete{john[age->?_]@foobar}.
//    	      	john[age->?A]@foobar.
//    	      	delete{john[name->?_]@foobar}.
//    	      	delete{john[salary->?_]@foobar}.


:- export{?[name -> ?], updatable ?[age->?]}.

john[name->John].
john[age->33].
john[salary->111111].