Example: core.json.php configuration

{
    "block_storage": {
        "smalldb": {
            "storage_class": "Smalldb\\Cascade\\BlockStorage",
            "storage_weight": 20,
            "alias": "smalldb",
            "backend_class": "Smalldb\\StateMachine\\FlupdoBackend",
            "resources": {
                "flupdo": "database"
            }
        }
    },
    "context": {
        "resources": {
            "database": {
                "factory": [ "Smalldb\\Flupdo\\Flupdo", "createInstanceFromConfig" ],
                "driver": "mysql",
                "database": "...",
                "host": "localhost",
                "username": "...",
                "password": "..."
            }
        }
    }
}