{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Addition response",
    "description": "Answer from addition service",
    "type": "object",
    "properties": {
        "answer": {
            "type": "integer",
            "minimum": 1
        }
    },
    "additionalProperties": false,
    "required": [
        "answer"
    ]
}