in terms of the application specific preference set, I meant something along the lines of:

"http://registry.gpii.org/applications/net.gpii.smarthouses": [{ 
    "value": {
        "fontSize": 14,
        "language": "en",
        "highContrastTheme": "yellow-black",
        "volume": 0.5
    } 
}]

But seeing that they all correspond to common terms, it might not make much sense