{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Measure",
    "description": "Inches measurement, must be even number of feet",
    "type": "object",
    "properties": {
        "length": {
            "type": "integer",
            "minimum": 0,
            "multipleOf": 12
        }
    }
}