{
    "principal":"PhotoFlash::Data::User::\"alice\"",
    "action":"PhotoFlash::Data::Action::\"view\"",
    "resource":"PhotoFlash::Data::Photo::\"VacationPhoto94.jpg\"",
    "context":{
        "role": ["admin", "user"],
        "person": { "name": "Alice", "age": 18 },
        "addr": { "street": "main", "city": "DC"}
    }
}