{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "description": "This schema represents a numerical value with a unit of measure.",
    "type": "object",
    "properties": {
        "value": {
            "description": "The numeric value of the element.",
            "type": "number"
        },
        "unit": {
            "references": [
                {
                    "description": "The unit of measure of the element. Allowed values are drawn from the Common synonyms (non-UCUM) column of [subset of] UCUM, SI and English units. ",
                    "url": "http://www.hl7.de/download/documents/ucum/ucumdata.html"
                }
            ],
            "type": "string"
        }
    },
    "required": [
        "value",
        "unit"
    ]
}