{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Vault Collection Expression",
    "type": "object",
    "properties": {
        "vaults": {
            "type": "array",
            "items": {
                "type": "string"
            },
            "_uniqueItems": true,
            "minItems": 1
        }
    },
    "required": [
        "vaults"
    ],
    "additionalProperties": false
}