ActionScript :: Flex : Mapping Objects To Classes?

If I've got a bunch of plain old Objects, what's the best way to map them to a bunch of Classes?For example, if I use an HTTPService to pull in some JSON, then deserialize it, I'll have a bunch of objects which look like:

{ type: "person",
id: 42,
name: "David" }

And I want to turn them into instances of a Person class:

class Person {
id:int;
name:String;
}

(also to be considered: how about some standard way of dealing with relationships between objects? For example, if the Person had an additional "spouse" field:

{ type: "person", spouse: 61, ... } // Where 61 is the ID of the spouse
)